My original apple IIe still works.
My subsequent beige mac with black and white inset video screen died, but only after about 4-5 years.
(A Gateway 300 MHz I bought in 97 still works, though I sold it; my dalliance with MS for the sake of playing games. Of course, 3 years after I bought it, I couldn't play any of the most current games on it any more, anyway).
My clamshell tangerine iBook 300 MHz still works, and is running os X like a champ (my wife is using it).
She would be using my subsequent iBook 500 MHz (white), but, it died! (at least, it is constantly troubled by small breakdowns, the last and hardest to fix cheaply, the video screen). Thankfully, it held on until I got my current mac...
I've had my current 17 inch Albook for about 2 months. Let's hope that the previous pattern continues, and this one will continue to work until I pass it on to someone else in 4-5 years.