Our 1998 Forester has 191,000 miles on it and we got it when it has 103,000. It seems that it is due for an alternator failure any time. My GMC truck, with 143,000 miles, had its alternator die yesterday with -30 F. weather. But fortunately I've got a heated garage, so got it changed easily. Just getting it home was the struggle.
I had a Nissan Stanza once and it seemed its alternator gave up sometime after 170,000 miles.
Just wondering what alternator experiences other's have had. I'm just trying to guess the most likely problems to turn up next. My guess is the starter motor and the alternator are the most likely things. I've already replaced plugs, wires, injectors, timing belt, timing belt tensioner, clutch, lots of pulleys.