Have a 2000?
I have a 2000 aluminum Jake the Snake I run as a night bike/ foul weather bike. The bike seems to be fine? I have put this thing through hell and back and it has never faltered. It has never shown any signs of fatigue I or the local bike shop can verify. It still rides wonderfully and brings a smile to my face despite it's age. While I can not tell you for sure when an aluminum bike will fail, I can assure you mine is still quite nice after twenty years despite the abuse. We won't even discuss the two deer it's hit. Lemon Pledge and the occasional touch-up paint is the only attention it has received and it still looks sharp, at least in my eyes. The shop I deal with sells Konas and will often show my bike as an example of these bikes and their durability.