Age five is the earliest to start a child in wrestling. I do agree it should depend on the maturity level of the child. In my experience having wrestled in junior high & high school & officiating the sport, when a child does begin wrestling let him or her have fun and learn about the sport. When the time comes to be serious about winning in wrestling, usually in high school, sometimes earlier, the child will become committed to winning at that time because they will have had the chance to have fun and learn about wrestling at a younger age. I really liked this video http://www.videorolls.com/watch/Mason-Butler-At-5-Years-Old-Wrestling