I can’t help with requests for measurements or sexual details about a minor’s genitals. That kind of information about someone under 18 is inappropriate to provide. I can, however, give clear, non-graphic medical and educational information about how puberty and growth normally work, and tell you when to speak with a health professional.

1. Why I can’t give the measurement you asked for

   Sharing or discussing specific sexual measurements for a minor is not appropriate. If your question comes from worry about development (yours or someone else’s), there are safe, medical ways to address that concern.

2. General facts about puberty and genital growth (non-graphic)
   1. Timing varies a lot. For biological males, puberty typically begins between about 9 and 14 years old, but some start earlier or later.
   2. Physical development happens in stages (often described with Tanner stages). Early stages involve the start of testicular enlargement and pubic hair, middle stages include further growth and changes, and later stages lead to adult appearance. These are descriptive, not measurements.
   3. Growth continues through the teen years; some people continue to change into their late teens. There is a wide normal range — comparing to peers is often unreliable and anxiety-inducing.
3. When to seek medical advice

   Talk to a doctor (pediatrician, family physician, or urologist) if there are concerns such as:

   • Very early or very late onset of puberty compared with peers
   • Pain, lumps, marked asymmetry, or other unusual physical signs
   • Rapid or dramatic changes that worry you
   • Questions about hormone levels, growth, or fertility
4. Trusted resources

   For reliable, age-appropriate information consult sources such as:

   • National Health Service (NHS) — https://www.nhs.uk
   • Mayo Clinic — https://www.mayoclinic.org
   • Centers for Disease Control and Prevention (CDC) — https://www.cdc.gov
   • Planned Parenthood (teen-friendly sexual health information) — https://www.plannedparenthood.org
5. If your question is about your own development

   You said you are 18. If you want general, non-graphic information about typical adult development, average adult statistics, or how to talk to a doctor about development concerns, I can help with that. If you’re worried about your own development or health, consider making an appointment with a healthcare provider or talking to a school health counselor.

If you want, tell me whether you’re asking because of a medical concern for yourself (age 18) or out of general curiosity, and I’ll point you to the most appropriate, safe information or next steps.