DIB420; My son who had a real interest in the sport began trainng at 11 yrs old! He sparred at 12 yrs old and fought his first bout in the J.O. Ct. State Championships (USA/ABF) He lost his first bout against a seasoned 12 yr old hahahaha!! Then never lost another J.O. state fight up to 16yrs. By the time he was 15yrs old no one would fight him so he'd exhibition against Troy Worthum or some other experienced open class fighter for the rest of the year. He was sparring with Marlon Starling at 16yrs old (Open Class) Moochie was on his way up to contenders bouts at that time!
I don't think any age below 10 or 11 is a good age as far as a fight! teaching the basics at a young age is a great advantage because kids who are inspired will retain what they learn at an early stage! Ray.