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.
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44.
Max Linder died on October 31, 1925 at the age of 41.
Max Jacob died on March 5, 1944 at the age of 67.
Max Adrian died on January 19, 1973 at the age of 69.
Max Bentley died on January 19, 1984 at the age of 63.