Adoption Age Rules · United States
How Old Do You Have to Be to Adopt a Child?
Minimum age by state, the 10-years-older rule, and whether you can ever be too old
The answer depends on which state you live in, what kind of adoption you are pursuing, and the agency you work with. This page lays out all three, plus the questions people ask right after: can you adopt at 18, can you adopt an adult, and how old can someone be and still be adopted.
Written By
Adoptive Family Case Worker · 16 years walking families through eligibility
Reviewed By
Licensed Clinical Social Worker · Executive Director
State rules summarized from each state's adoption statute and the Child Welfare Information Gateway. Laws change; confirm your state's current rule before you rely on it.
Last updated: October 14, 2026
The short answer: you have to be at least 18 to adopt a child in most U.S. states, 21 in Colorado, Delaware, Georgia, and Oklahoma, and 25 in Idaho. Several states, Utah among them, also require you to be at least 10 years older than the child. There is no maximum age in any state. Licensed infant adoption agencies usually set their own floor at 21, and a home study, not your birthday, decides whether you are ready.
Key Takeaways
How old do you have to be to adopt a child? 18 in most states, 21 in a few (Colorado, Delaware, Georgia, Oklahoma), and 25 in Idaho. Licensed infant adoption agencies, including ours, usually require 21.
Do you have to be a certain number of years older than the child? In several states, yes: at least 10 years older, including Utah, Georgia, New Jersey, South Dakota, and Alabama. Idaho asks for 15 years. Stepparent and relative adoptions are often exempt.
Is there a maximum age to adopt? No U.S. state sets one. Agencies and foreign countries sometimes do, and every home study weighs your health and ability to parent for the long term.
Can an 18-year-old adopt a 17-year-old? Almost never. A 17-year-old is a minor, so minor-adoption rules apply: a minimum age of 18 to 25 and, in many states, a 10-year age gap. Guardianship or adult adoption after the teen turns 18 are the realistic routes.
Can you adopt an adult? Yes, in nearly every state. Only the adult being adopted has to consent, and some states still require the adopter to be older by a set number of years.
The Minimum Age to Adopt, State by State
Adoption is governed by state law, and every state sets a minimum age for an adoptive parent. Most simply say “any adult,” which means 18. A handful set the bar at 21 or 25, and several add a second test: you must be a certain number of years older than the child.
| Minimum | Where it applies | Notes |
|---|---|---|
| 18 | Most states: any legal adult may petition to adopt. Examples include Kentucky, Louisiana, Montana, New Jersey, Tennessee, and Washington. | Agencies typically add their own floor of 21. |
| 21 | Colorado (a court may approve a younger petitioner), Delaware, Georgia, Oklahoma. | Georgia lets married applicants adopt at 21 and asks single applicants to be 25. |
| 25 | Idaho, unless you are at least 15 years older than the child. | The highest fixed minimum in the country. |
| 10 years older than the child | Utah, Georgia, New Jersey, South Dakota, Alabama, and a few others, on top of any minimum age. | Utah: Utah Code 81-13-203(5). Alabama lets a court waive it. |
Two things sit on top of the statute. First, the agency: most licensed infant adoption agencies, including A Act of Love, require applicants to be 21 or older, because the home study has to find that you can parent a child for the next two decades and the placement has to hold up in court. Second, the type of adoption: foster care licensing, international programs, and stepparent adoptions each have their own rules, covered below.
Sources: each state's adoption statute as summarized by the Child Welfare Information Gateway and FindLaw's eligibility overview. Check your own state before relying on a number.
The 10-Years-Older Rule
Several states do not care much about your age in years; they care about the gap between you and the child. The idea is that an adoptive parent should be a parent, not an older sibling. Utah is the clearest example: under Utah Code 81-13-203(5), an adult may not adopt a minor unless the adult is at least 10 years older than the child, or, for a married couple adopting together, at least one spouse is.
Georgia, New Jersey, South Dakota, and Alabama have the same 10-year rule, and Idaho asks for 15 years unless you are 25. Most of these states exempt stepparents and close relatives, and Alabama lets a judge waive the gap when it makes sense. In the rest of the country there is no gap requirement at all, though a home study provider will still ask how a very small age difference affects the parent-child relationship.
For a newborn, the rule is rarely a problem: anyone 21 or older clears it. It matters when a young adult wants to adopt an older child or a teenager, which is the next question.
Is There a Maximum Age to Adopt?
No state sets a maximum age for adoptive parents. The question comes up because agencies and foreign countries sometimes do. International programs commonly cap adoptive parents around 45 to 55 for infants and set a required gap of 25 to 45 years between parent and child. Some private infant agencies set their own cutoffs in the late 40s or 50s; many, including ours, do not.
What replaces an age limit is the home study. The evaluator asks about your health, your support network, your finances, and your plan for raising a child through college. A healthy 52-year-old with a strong support system passes; the question is readiness, not a number. In domestic infant adoption there is a second filter, and it belongs to the expectant mother: she chooses the family, and some mothers prefer older, settled parents while others prefer younger ones. Foster care adoption has no upper limit anywhere, and older parents are often exactly who a teenager needs.
Can You Adopt at 18? Can an 18-Year-Old Adopt a 17-Year-Old?
Legally, in most states, an 18-year-old can petition to adopt. In practice it is rare. Agencies require 21, the 10-years-older rule blocks most pairings, and a home study has to be convinced that an 18-year-old can support a child for twenty years. The exception courts do approve is a young adult adopting a much younger sibling or relative after a family crisis, usually with guardianship first.
The question people actually type is whether an 18-year-old can adopt a 17-year-old, often a partner or a friend who needs a safe home. The honest answer is almost never. A 17-year-old is a minor, so minor-adoption rules apply: the state's minimum age, the age gap where one exists, and the consent or termination of the 17-year-old's parents' rights. No judge will approve a one-year gap as a parent-child relationship. The realistic routes are:
- ●Legal guardianship. An adult over 18 can ask the court to be appointed guardian of a minor, with the parents' consent or a finding that it is in the minor's best interest. It gives the authority to house, enroll, and consent for the teen without ending anyone's parental rights.
- ●Wait, then adult adoption. Once the 17-year-old turns 18, adult adoption needs only the two adults' consent in most states. The catch is the age gap: Utah and a few other states still require the adopter to be 10 or more years older, even for adults.
- ●Emancipation or state help. If the teen is unsafe at home, the state's child welfare line or a youth shelter can open options that an 18-year-old cannot provide alone.
How Old Do You Have to Be to Adopt Someone Over 18?
Adult adoption is legal in nearly every state and is simpler than adopting a child. The person being adopted consents for themselves, their birth parents are not involved, and there is no home study. People use it to make a stepparent, a former foster parent, or a long-time mentor a legal parent, and sometimes for inheritance.
The age rules that remain are about the gap, not a minimum. Utah requires the adopting adult to be at least 10 years older than the adult being adopted. Virginia asks for 15 years. Many states, including North Dakota and New Hampshire, only require that the adopter be older. A few states narrow adult adoption to stepchildren, former foster children, or adults with disabilities, and Colorado lets a court treat an 18- to 20-year-old as a child for adoption purposes. Our types of adoption guide explains where adult adoption fits among the others.
How Old Can You Be to Be Adopted?
Any age. Newborns are placed directly from the hospital through domestic infant adoption, children and teenagers are adopted from foster care, and adults are adopted through adult adoption. There is no cutoff at 18; the process simply changes from a minor adoption to an adult one.
What does change with age is whose consent is needed. For a baby, the birth parents consent. From about age 10 to 14, depending on the state, the child must also agree to their own adoption; Utah requires the consent of a child who is 12 or older. From 18, only the adult being adopted consents. A birth mother who is considering adoption for an older child, rather than a newborn, can read our page on putting a child up for adoption at any age.
Age Rules by Type of Adoption
The same person can be too young for one program and welcome in another. Here is how the age rules line up across the main types of adoption.
| Type of adoption | Minimum age | Maximum age | Age gap |
|---|---|---|---|
| Domestic infant adoption through an agency | 21 at most agencies, 18 to 25 by state law | No legal limit; the home study judges health and stamina | 10-years-older rule applies in some states |
| Foster care adoption | 18 or 21, set by the state | None | Rarely applied; licensing looks at the home, not a gap |
| International adoption | Set by the child's country, often 25 to 30 | Set by the country, commonly 45 to 55 for infants | Many countries require a gap of 25 to 45 years |
| Stepparent adoption | Any adult married to the child's parent | None | Usually exempt from gap rules |
| Relative (kinship) adoption | Any adult, same minimum as the state | None | Often exempt; the court can waive it |
| Adult adoption | Any adult | None | Some states require 10 to 15 years; Utah requires 10 |
Marital status does not change the age rule anywhere except Georgia, which sets 21 for married applicants and 25 for single ones. Single adults adopt through our program at the same minimum age as couples.
Age Is the Easy Part: What Else Agencies Look At
If you clear the minimum age, you have cleared the simplest requirement. What decides an adoption is the home study: background checks for every adult in the home, a safe and stable place to live (owned or rented), financial stability without any set income threshold, general health, references, and a conversation about why you want to adopt. Our requirements to adopt a baby page answers each of those question by question, and the home study guide walks through what the visit is actually like.
If you are 21 or older and hoping to adopt a baby, the next step is a free conversation with a case worker. If you are younger, the most useful thing you can do now is build the stability a home study will look for: steady housing, steady income, and people around you who will help.
Adoption Age FAQ
How old do you have to be to adopt a child?+
In most states you must be at least 18. Colorado, Delaware, Georgia, and Oklahoma set the minimum at 21, and Idaho sets it at 25 unless you are 15 years older than the child. Most licensed adoption agencies require applicants to be 21 or older regardless of state law.
How old do you have to be to adopt a baby?+
The state minimum is 18 to 25, but nearly every licensed infant adoption agency requires 21. A Act of Love Adoptions works with adoptive families who are 21 or older and have completed a home study.
Is there an age limit for adoption?+
There is a minimum age in every state but no legal maximum anywhere in the United States. Some agencies and most foreign countries set upper limits, and every home study considers whether you can parent a child through to adulthood.
How old is too old to adopt?+
Legally, never. In practice, families in their 40s and 50s adopt infants every year, and foster care welcomes parents of any age. Agencies look at health, energy, and support system rather than a birthday, and an expectant mother choosing a family decides what matters to her.
Can you adopt at 18?+
In states with an 18 minimum you are legally eligible, but most agencies will not accept applicants under 21, and the home study must find you ready to parent for twenty years. Adopting a younger sibling or relative at 18 is the most common situation, and a court can approve it where the age-gap rule does not apply.
Can an 18-year-old adopt a 17-year-old?+
Almost never. Because the 17-year-old is a minor, minor-adoption rules apply: the minimum age in that state and, in many states, a requirement to be at least 10 years older. The practical routes are legal guardianship now, or adult adoption after the 17-year-old turns 18 in a state without an age-gap rule.
How old do you have to be to adopt someone over 18?+
You must be an adult yourself, and in some states older than the person you adopt by a set amount: 10 years in Utah, 15 in Virginia. The adult being adopted consents for themselves; their birth parents do not need to.
Can an adult be adopted?+
Yes. Adult adoption is legal in nearly every state and is often used to make a stepparent or former foster parent relationship legal, or for inheritance. A few states limit it to stepchildren, former foster children, or adults with disabilities, so check your state.
How old do you have to be to be adopted?+
There is no minimum or maximum. Newborns are placed from the hospital, children of any age are adopted from foster care, and adults can be adopted through adult adoption. From about age 10 to 14, depending on the state, the child must agree to their own adoption; in Utah the age is 12.
Do you have to be 10 years older than the child you adopt?+
Only in the states that have that rule, including Utah, Georgia, New Jersey, South Dakota, and Alabama. Idaho requires 15 years. Elsewhere there is no gap requirement, and most states exempt stepparents and relatives.
Can a single person adopt, and does the age rule change?+
Yes, single women and single men adopt through agencies and foster care, and the age rules are identical to those for couples. Georgia is the one state that sets a higher minimum for single applicants, 25 instead of 21.
How old do you have to be to adopt in Utah?+
Any adult can petition, and the adopting adult, or at least one spouse of a married couple, must be at least 10 years older than the child under Utah Code 81-13-203. Licensed Utah agencies generally require applicants to be 21.
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