11 for me. My son started when he was 9 (he is almost 12 now). I had to hide my 1st edition AD&D books under the matress (stupid media) - he's got someone that drives him to the local hobby shop.
The soft Sunglass bags (with drawstrings) that Oakleys used to come in. I have no idea where the sunglasses are now... apparently the bags were the best part.
I started playing at age 11 in 1982. Someone brought a box set in during the last week of 5th grade and led us through a pure hack and slash. I didn't understnad anything - just that I had a 3x5 card with a bunch of numbers, weapons, and spells. I was a master with my darts and I was hooked...