One of my buddys is now almost 13, but started at 11 years old. he has a account here on divebuddy. my 15 year old dives as well and started at 12. Experiencing diving through there eyes is wonderful. my younger son sometimes swims like he is walking, just needs practice . They love diving in Cozumel.I wish I dove that young. would have gone further in training. I think its all maturity. Good Luck