Jacks of all Trades

To me, life is more enjoyable in phases. I'm interested in certain things for a while and then move on to other things which too grow old and I pick up something else. Most people do this to some extent, but some specialize enough to be called experts in an area. I think I'll never know enough about one subject to be called an expert.

Have you found something that has sticked with you for most of your life or do you change your focus on things after a while?