The friend with the 4 year old that dsjbean is reffering to is me.........my son just turned 4 this month....and as Doug mentioned, he flies on the sim and can fly my MiniMax electric at altitude....but like YNOT stated, attention span is the biggest thing....if he's into flying at that moment, you can forget about it.....when he is into it....he flies pretty well. You just can't push them when they're in a "not into it" mode. When they are ready, they'll let you know.

Mike