I was thinking about this same thing last night. About passion for what you do. It was all sparked by a trip to Florida a couple of weeks ago...
It was really more about the idea of work, compared with life.
My Uncle was raised on a small farm in Pennsylvania. At the age of 17, he was the only person in his high school ever to have held the position as president of both the national honor society and future farmers of america. He went to school, he studied agriculture, he got his PHD. He now grows food in space for NASA. Truly an interesting man. I don't think he has any concept of work though. Agriculture is in his blood, so he just does what he LOVES all day - growing plants (just in zero gravity and at weird radiant light ratios).
So I thought about this too, how nice it would be if I didn't think of work as work - but rather something they NEED me for. Something that is my purpose and something that I just do well because I love it. Something that I could care less about working for 12 hours straight on. I'm only 25 too, and I work as a journalist, writer, editor - and (much to my dismay) marketer of things.
Hopefully, at some point, I'll be doing what I love - and won't even think of it as work - but that's the dream I'm chasing at the moment. hope you all are too...