In most states, someone can adopt you after you turn 18. Adult adoption is a court process that creates a legally recognized parent-child relationship between two consenting adults, and once a judge signs the decree, the adoptive parent becomes your legal parent for inheritance, next-of-kin status, and your birth certificate. The rules differ from state to state, and a handful of states either prohibit adult adoption or limit it to narrow situations like stepparent relationships or adults with disabilities.
Why Adults Get Adopted
The most common reason is formalizing a relationship that already functions like family. A stepparent who raised you, a foster parent who stayed in your life after the system let go, a grandparent who did the actual parenting — adult adoption puts a legal label on what was already true. Before nationwide marriage equality, same-sex couples also used adult adoption to secure inheritance rights, hospital visitation, and medical decision-making authority when no other legal route existed.
Inheritance is the other big driver. When someone dies without a will, state intestacy law decides who inherits, and those laws favor spouses and children above everyone else. An adopted adult child has the same intestacy standing as a biological child, which makes adoption a stronger tool than a will alone, since wills can be contested by relatives.
Adoption is also used for adults with disabilities. It creates a permanent familial bond that goes beyond guardianship and simplifies long-term decisions about medical care, housing, and financial support.
Which States Allow It
Most do, but the restrictions run from almost nothing to quite strict. Alabama limits adult adoption to people who are totally and permanently disabled or have an intellectual disability. Idaho requires either that the adopter maintained a parent-child relationship with the adoptee for at least a year during the adoptee’s childhood, or that a court finds a substantial family relationship already exists. Arizona restricts adult adoption to stepchildren, nieces, nephews, cousins, grandchildren, and former foster children where the foster parent kept a continuous relationship for at least five years. Illinois requires the adoptee to have lived in the adopter’s home for at least two continuous years, or to be a relative.
Louisiana allows stepparent adult adoptions without court approval but requires a judicial hearing for all other adult adoptions. Connecticut allows adult adoption by written agreement but prohibits it between spouses, siblings, and aunts or uncles. Because the rules vary this much, the first practical step is reading your own state’s adult adoption statute before spending time or money on the process.
What the Law Requires
The one universal requirement is your consent. You’re a legal adult, so no court will approve the adoption unless you agree, freely and without coercion. The judge will confirm this directly, usually at the hearing itself. Your biological parents have no say and don’t need to consent — their legal authority over you ended when you turned 18.
Most states require the adopter to be older than the adoptee, and several require a specific age gap. Nevada and Utah require at least 10 years between the parties. Virginia requires 15. Even where no number is specified, a judge can reject a petition if the age difference looks inconsistent with a real parent-child relationship.
If either party is married, the spouse’s consent is often required, because creating a new parent-child relationship affects marital property, inheritance, and family dynamics. A spouse who refuses to sign can block the adoption in states that require it.
Courts also look at whether the adoption serves a legitimate purpose. Petitions that appear designed to formalize a romantic or sexual relationship rather than a parent-child bond get rejected. A well-known 1984 New York case turned down a man’s petition to adopt his same-sex partner on that ground, and judges continue to scrutinize petitions where the relationship doesn’t resemble parent and child.
How the Process Works
The adopter files a petition for adult adoption in the county where either party lives. The petition states the intent to create a parent-child relationship and is filed with signed consents from the adoptee and, where required, from spouses. Home studies and background investigations are almost never required for adult adoptions. The court relies on the hearing itself.
After the petition and filing fees are in, the court sets a hearing. These hearings are often brief, sometimes only a few minutes. The judge verifies identities, confirms your consent is genuine, and checks that the adoption serves a legitimate purpose. If it does, the judge signs a decree of adoption that finalizes everything that day.
Many states let you request a name change as part of the same proceeding, so you don’t need a separate name-change petition. The adoption decree itself can include the new name, and it will appear on the reissued birth certificate. If a name change matters to you, ask whether your state’s petition form has that option built in.
What It Costs
Court filing fees vary by county but generally run a few hundred dollars. Attorney fees for an uncontested adult adoption typically fall between $500 and $2,500, higher if complications arise. Some people handle uncontested cases without an attorney using court self-help forms, though availability and quality of those forms vary by jurisdiction.
What Changes Once the Decree Is Signed
The legal effects are immediate. The adoptive parent becomes your legal parent for all purposes, and you become their legal child, with the same standing as a biological child for inheritance, medical decision-making, and next-of-kin status. The state seals your original birth certificate and issues a new one listing your adoptive parent. If the decree included a name change, the new certificate reflects that too.
Your Biological Parents’ Legal Status
This is where adult adoption gets genuinely complicated. In many states, adult adoption does not automatically sever the legal relationship with your biological parents the way minor adoption does. Colorado’s adult adoption statute, for example, explicitly preserves the biological parent-child relationship, so the adoption adds a legal parent without removing the existing ones. Other states treat adult adoption like minor adoption and cut those ties entirely.
The stakes are real. If your state severs the biological relationship, you lose intestacy inheritance rights from your biological parents. If your state preserves it, you may inherit from both sides. There is no uniform national rule, so confirm your state’s specific approach before you finalize anything. An adoption meant to add a family connection can inadvertently erase one.
Inheritance Through the Adoptive Parent’s Relatives
Adult adoption clearly establishes inheritance rights between the adopter and adoptee. What’s less clear is whether you’d count as a “child” or “descendant” under wills and trusts written by the adoptive parent’s relatives. Courts are split. The Uniform Probate Code, adopted in some form by many states, generally excludes adult adoptees from class gifts in third-party trusts unless a real parent-child relationship existed before the adoption. An older doctrine called the “stranger to the adoption” rule went further and limited the inheritance effects to the direct adopter-adoptee relationship. Some courts have gone the opposite way and treated adult and minor adoptees identically. If inheriting through a family trust is part of the motivation, consult an estate planning attorney familiar with your state’s case law.
What Adult Adoption Won’t Do
Adult adoption is not an immigration tool. Under the Immigration and Nationality Act, a “child” for immigration petition purposes must generally have been adopted before turning 16, with a narrow exception extending the cutoff to 18 for siblings of children adopted before 16.1U.S. Department of State. 9 FAM 502.3 – Immigrant Visa Petitions Adopting someone at 18 or older does not make them eligible for an immigrant visa as your child. The Child Citizenship Act, which lets adopted children acquire U.S. citizenship automatically, also requires the conditions to be met before the child turns 18.2U.S. Citizenship and Immigration Services. Adult Adoptees and U.S. Citizenship A U.S. citizen can technically file a family-based petition for an adopted son or daughter over 21, but only if the adoption itself happened before age 16.3U.S. Citizenship and Immigration Services. Family-Based Petition Process
It also won’t get you the federal adoption tax credit in most cases. That credit covers qualified expenses for adopting an “eligible child,” which the IRS defines as someone under 18 or someone physically or mentally unable to care for themselves. Adoption also doesn’t automatically make the adopted adult a tax dependent — the standard residency, income, and support tests still apply.
Social Security survivor benefits for a child require the recipient to be under 18, a full-time student aged 18 to 19 in elementary or secondary school, or at least 18 with a disability that began before age 22.4Social Security Administration. Benefits for Children A healthy adult adoptee over 19 will not qualify as a child survivor.
Can It Be Undone?
Yes, but not simply. An adopted adult who has reached the age of majority can petition the court to reverse the adoption. Adoptive parents can seek reversal as well, and biological parents can in some circumstances. Courts evaluate whether vacating the adoption serves the interests of the parties, and a joint petition where everyone agrees is the most straightforward route. Reversal does not automatically restore the legal relationship with your biological parents. You may need a separate proceeding to reestablish those ties, and some states may not allow it at all. Treat adoption as a permanent legal change, because undoing it is far harder than creating it.