That's a fair point, and I've known a good two dozen who waited too long.
Rip, I'm not trying to be shitty. It's a tough call, and being told that you have less than a third of the cartilage left in both knees at 23 is soberingly scary. I'm also a catastrophist, and I've lost a good bit of faith the last several years in the institutions of medicine and science... BEFORE 2020. As I said, I'll take what you and others have said into my own consideration. I just wanted to share what little I knew and had been told. As with other things... sometimes it's refreshing to be wrong.