My son just turned 5 and he started to wakeboard on his own. He looked forward to it all winter, just needed some warm weather before he would get in our freezing lake. Here is a quick video of his third time riding this year. he has progressed already. And yes, he is wearing his shorts over his full suit like dad, lol.
I can honestly say as good as it is to learn a new trick, watching your kids do it is even better.