In 87% of men, the penis continues to grow up to the age of 21-22 years by itself. Except for people who suffer from having a “micropenis”, in which case the growth of the penis stops in childhood itself.
However, it is possible to gain an extra few centimetres after the age of 22 thanks to exercise stimulation in order to get closer to the ideal penis size (wich is perfectly possible according to my own experience).
The penis, like the human being, experiences a growth spurt usually beginning and ending with puberty. Thus, penis size reaches a closing point around the age of 22. Some people enjoy a few more years of growth; however, this is not the norm.
The average inches/millimetres of growth per year is relative to each person; however, estimation fixes this growth on at least 0.19 inches or 0.5 cm per year.
Men with micropenis, on the other hand, see the growth of the penis as non-existent due to hormonal problems preventing natural growth. Development of the micropenis ends a few years after initiation or never begins at all; giving rise to penises with a size of less than 2.7 inches or 7 centimetres.
Bachelor of Science in Nursing (UNITEC).
Master in Scientific, Medical and Environmental Communication (IDEC-UPF)