I'd say, start whenever you want to; it all depends on how quickly you pick things up; and how determined you are.
Down where I train there's a 6 year old doing boxing; and there's 30 year olds starting up,
But if you're interested in going pro; I'd definitely say as soon as possible!
It varies per the individual. Sometimes a boxer can "burn-out" (Sean O'Grady comes to mind). Pick your age to begin.
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If you are planning on competing the recommended age is between 6 and 14, also, the tween years depend largely on "natural talent" and background. You can get away with starting boxing relatively late at the age of 14, if you had a rough childhood in a rough neighborhood where fights are frequent, and little kids get bullied a lot.
Although only somewhat related to Boxing, action star Jet Li, who competed in Wushu (full contact sporting Kung Fu), says that you can learn the skills of any combat sport at any age you want. Provided you are fit enough for it and well preserved enough for your age. Nevertheless, to be a serious competitor, you need to begin training if at all possible from the age of 5, and have your first amateur match by age 12. As a general rule with combat sports, Li says, "It's always best to start as a child, if you are planning on having that as a career path at which point your parents or guardian choose for you."
You can start boxing at any age , but most boxing gyms have an certain age group they will train.
I think that you have to be 13 to start fighting but can go to lessons from any age.