One can begin jelqing as soon as puberty hits, as is custom in arabian culture. So yes, 12 is a good age to start. It is said that jelqing, when done properly, will increase the boy's size and girth of his penis later in life.
There is no max age. It depends on your health.
I believe it is something a man will do to grow his penis.
Ninr
It does not help to increase penis size, and it can be dangerous to the delicate tissues in your penis.
19
Currently 24
44.
Max Beckmann died on December 27, 1950 at the age of 66.
Max Carey died on May 30, 1976 at the age of 86.
Max Perutz died on February 6, 2002 at the age of 87.
Max Jacob died on March 5, 1944 at the age of 67.