At what age does lengthening of the penis typically occur for males?

The typical age at which lengthening of the penis occurs in males is generally between 11 and 12 years old, which aligns with the onset of puberty. During this stage, boys experience a surge in testosterone, which leads to the development of secondary sexual characteristics, including genital maturation. The penis begins to grow in size as part of these changes, with growth often peaking during the early to mid-teenage years.

The timing of puberty can vary for each individual, but significant changes, including penile lengthening, usually begin around this age. It is important to consider that while some boys may start experiencing these changes slightly earlier or later, the 11 to 12-year age range is when most boys will begin to notice this development.

The other age ranges specified in the options refer to periods when changes may continue or when other developments, such as increased testicular volume or increased muscle mass, occur, but the primary period for the initial lengthening of the penis tends to fall within the early pre-teen years.