Until What Age Does the Penis Grow?

Penile growth usually begins at the same time as the start of puberty, and in most boys it ends between the ages of 16 and 21. This means that during this time frame, growth in penile length and thickness gradually stops.

Of course, the exact age at which growth stops is different for each person and depends on factors such as genetics, the age when puberty begins, hormone levels, and even nutrition. As a result, one person may reach final growth earlier or later than this range.

During puberty, which usually begins around ages 11 to 12, the body comes under the influence of the hormone testosterone and experiences many changes. One of these changes is enlargement of the penis and testicles.

Penile growth usually occurs first in length, and then thickness increases. This process continues until hormone levels become stable. Usually, between ages 12 and 15, the rate of penile growth is faster, and after that it slows down, but slight growth may continue into the early 20s.

If by age 14 or 15 the early signs of puberty, such as increased height, growth of hair in the genital area, or voice change, have not appeared in an adolescent, or if penile growth seems to have stopped, it is better to see an endocrinologist or urologist for further evaluation.

Naturally, puberty in boys occurs according to the Tanner stages and follows a specific sequence:

• Start of puberty (ages 9 to 14): The first sign is enlargement of the testicles (testicular length greater than 2.5 centimeters or volume greater than 4 milliliters).

• Changes in pubic hair (from ages 11-12): Soft, sparse hairs appear first, then become thicker and darker and spread toward the abdomen and thighs.

• Penile growth (ages 12 to 15 - peak growth): Penile length increases first, then diameter increases, and at the same time the testicles and scrotum continue to grow.

• General body changes (ages 13 to 16): A height growth spurt, voice change due to enlargement of the larynx, and increased muscle mass are seen.

• Final maturation (ages 16 to 18): Body and facial hair become complete, height stabilizes, and growth of the penis and testicles is completed.

Early medical evaluation can reduce worries, and if there is a problem, it can help prevent it from progressing. Remember that the pattern of penile growth is completely different from one person to another, and comparison with others usually causes unnecessary anxiety.