My bikes are all steel but I'm always doing searches on how long things last. Cars, bikes, guns, power tools ....

I found a guy who owns a Trek 1420 circa 1991/2 . They have aluminum frames and it's owner puts on 14K/year. His bike had 140K miles on it before he replaced it. My guess is that he or his LBS stripped all the threads from several rebuilding sessions.

I've never met anyone in person that spent that much time on a bike but I guess they are out there. He looked like a 25 year old with grey hair and a grey beard. He was probably in his mid 50's.