In most places, you need to be at least 18 to be eligible for bottom surgery, which includes procedures like vaginoplasty, phalloplasty, and metoidioplasty. The latest international guidelines from the World Professional Association for Transgender Health (WPATH) recommend that patients reach the legal age of adulthood in their country or region before pursuing gender-affirming genital surgery. In practice, most people who undergo these procedures are significantly older than 18.
What the Major Guidelines Say
WPATH’s Standards of Care, Version 8, released in 2022, shifted away from setting a single global minimum age. Instead, it ties eligibility to the age of adulthood wherever a person lives or seeks care. In the United States, that means 18 in most contexts. The guidelines also place greater emphasis on individualized assessment rather than rigid age cutoffs, meaning a care team evaluates each person’s readiness based on multiple factors rather than age alone.
In the UK, the NHS allows young people aged 17 or older to be seen in adult gender identity clinics or referred to one from a youth gender service. However, genital surgery still typically requires reaching adulthood, completing a referral process through a gender dysphoria clinic, and having socially transitioned for at least a year before a surgical referral is made.
US State Laws Add Another Layer
Even where medical guidelines permit surgery at 18, state laws in the US can impose additional restrictions. A growing number of states have passed laws prohibiting gender-affirming surgical care for minors. Alabama, Florida, and Texas all ban surgical procedures for people under 18. Nebraska goes further, prohibiting surgical gender-affirming care for anyone under 19, meaning even 18-year-old adults are affected.
These laws apply specifically to surgical care. The legal landscape changes frequently, so the rules in your state may differ from what was true even a year ago. KFF maintains a policy tracker that maps current restrictions state by state.
How Old Most People Actually Are
The legal minimum and the typical age are quite different. A large national study published in JAMA Network Open found that genital surgeries are far more common among older patients. Among people aged 19 to 30, breast and chest procedures were twice as common as genital procedures. Genital surgery gradually increased with age and became the most common type of procedure in patients over 40. The average age for vaginoplasty was 40, and for orchiectomy it was 37.
This pattern reflects the reality that bottom surgery usually comes after years of other steps: social transition, hormone therapy, mental health support, and often chest surgery first. It’s rarely the first or even second step in a medical transition.
Prerequisites Before Surgery
Age is only one requirement. Before bottom surgery, most surgical teams expect you to have been on hormone therapy for a minimum period. For vaginoplasty, many surgeons require at least 6 months of estrogen-based hormone therapy to allow tissue changes that improve surgical outcomes. Phalloplasty typically requires at least 6 continuous months of testosterone. Metoidioplasty has a longer hormone requirement, at least one year, because the procedure relies on testosterone-driven tissue growth to achieve good results.
Beyond hormones, you’ll generally need documentation of a consistent gender identity, letters from mental health professionals, and evidence of social transition. The exact number of referral letters and evaluations varies by surgeon and clinic, but two independent assessments from qualified professionals is a common standard for genital procedures.
Rules for Minors Under 18
Bottom surgery for people under 18 is rare and increasingly restricted by law in many US states. In jurisdictions where it remains legally possible, all stages of gender-affirming medical treatment for minors require consent from parents or legal guardians. This applies even when a young person is considered mature enough to consent on their own. If parents and medical providers disagree about the appropriateness of treatment, a court may need to get involved.
A study examining surgical outcomes in minors found that the procedures performed were overwhelmingly chest surgeries, not genital surgeries. Complication rates in that group were low and comparable to adult outcomes, with no major complications like mortality, bleeding complications, or sepsis. The most common issue was unplanned reoperation for a blood collection at the surgical site, which occurred in about 3% of cases.
What the Process Looks Like in Practice
If you’re exploring bottom surgery, the timeline from first inquiry to operating room is typically measured in years, not months. You’ll start with a referral to a gender identity clinic or a therapist experienced in gender care. From there, you’ll begin or continue hormone therapy while meeting the documentation requirements your surgeon needs. Surgical wait lists themselves can add months to over a year depending on the surgeon and your location.
The total process, from beginning hormone therapy to recovering from genital surgery, commonly spans two to five years or more. Recovery from bottom surgery itself takes several months, with vaginoplasty and phalloplasty requiring the longest recovery periods and sometimes staged procedures spread over multiple surgeries.