11 for me, and I'm now 65 and still enjoying it 4 to 6 times a week

I didn't jerk off till I was 14 I think, always preferred to hump something. I was humping my mattress at 5yrs.

12...

about 12 or 13. me and a friend would jerk off looking at playboy. i remember the first time i saw his dick, it was as big as mine. i loved to watch him jerk that huge dick of his. we would jerk for 2 or 3 hours before we would come. one time i came so hard that it hit some stuff on a shelf behind the toilet. and he could sure make a mess with his all over his belly.. we would walk around with ragging hard-on's when we slept outside.

I was 11 at the time. A friend of mine taught me how to do it. I was so small then, I had to use a thumb and two fingers, but after a few tries I managed to cum.

12, discovered it myself, felt so nice rolling my foreskin back and forward, got such a shock when it turned into an orgasm without cum, thought I had done some damage, soon tried it again, even more when I found out what it was all about.

12, was great...

I was 8 when my uncle played with me. I liked it a lot

I remember to have had my first erection with 4 (!) .Said to my mum: "See, I'm able to 'move' my dicky", while I contracted my little 'lovemuscle'. and loved to have a stiffy ever since. But I really started to wank when I was ten.

11 or 12 for me. I discovered it on my own. I'd always played with myself, having a hunk of foreskin to entice me and to experiment with. One day it "HAPPENED" while lying in bed and I was tugging and twisting it. I got up, went into the bathroom and immediately did it again, intentionally and more traditionally by stroking. What a life-changing discovery!!!

13 my friend..was the first for me...

Twelve...

I don't think being "acceptable" has anything to do with it,...most kids start when they feel the need/want, and since they mostly (but not always) do it privately, it's their own business really. I was about 10 when I started which was quite a long time before I reached puberty in the accepted sense of pubic hair and muscle development.