Capacitors are very much like batteries in how they function and even in chemistry (i.e. electrolytic) so no wonder they wear out.
Some caps dry up over time especially if they get hot (i.e.Tantalum).
There as been a lot of improvement in capacitor technology in the past years,older designs did not benefit from those.
The funny thing is that your PC or cel. phone probably uses better components in some cases than your high end audio gear it's KHz vs. GHz , the good thing is those technologies eventually trickle down to Audio gear but rarely the opposite.
Some caps dry up over time especially if they get hot (i.e.Tantalum).
There as been a lot of improvement in capacitor technology in the past years,older designs did not benefit from those.
The funny thing is that your PC or cel. phone probably uses better components in some cases than your high end audio gear it's KHz vs. GHz , the good thing is those technologies eventually trickle down to Audio gear but rarely the opposite.