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I can crack my knuckles by simply making a fist or a claw with my hands and have been able to do so for years...probably 10-15 years. I think it's probably a nervous twitch or something as I probably do it way too often. I'm 33 now and I can tell you that over the last couple of years I've noticed that I do feel some aching sort of pain while playing sports like hockey, baseball, and golf. Now, I'm also in IT and on a computer probably at least 10-12 hours a day and that could also be adding to the pain as well...who knows.
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