The oldest PSU I have that still works is 14 years old (reviews back in 2006, I think I bought it in the fall). it's an Enhance ENS-0560G model that I use for charging LIPO RC batteries. I modded the wires and jumpered it to boot without a motherboard connection. I've charged at 30A on two 12v rails combined and no problems. Granted, it hasn't been used much in the past 6 years since I retired it from full-time computer useage, but it still works fine.