@medacris: My father doesn't really understand why I enjoy video games as much as I do either. However, the thing I have found best is to respect his opinion.
He has most definitely lived longer than you have and believes that playing games is a waste of time on this earth.
Honestly, logic dictates that he is probably right. Living life actively i.e not sitting in one position exploring another world, may actually be pretty awesome.
But I really like video games.....like alot. So I try and balance. I throw myself into something HE spends his time doing, with the same level of enthusiasm I carry when I jump into a new game. All in hopes of easing the thought in his mind that says, "what is my son doing with his life."
And when I have a son, I'm going to spend time doing whatever it is my son wants to do. <3