aging is fun:

The internal medicine resident just turned 30. The other day, he hurt his back for no apparent reason, which led to this helpful conversation:

Neurologist: "I think it's because you're getting older. Aging sucks."

Resident: "Yeah, I don't think it's that."

Neurologist: "Maybe you suddenly have arthritis?"

Resident: "No!"

Internist: "You know, aging is really great. It's like this - your body works just fine until you're about 30 to 33-34, at which point the metabolism switch flips from 'I can do no physical activity for six months and then run five miles without exerting myself' to 'Hey, I ate two pancakes yesterday and now I weigh four hundred pounds'."

Resident: "Thanks, you guys. This is really encouraging."