The voltages and temperatures for these caps are nothing like power amps.Google capacitor lifetime.
I remember a video about when to change caps. I think the time scale he used for when to change some speaker's capacitors, was twenty years. I think it was the question that someone had written in and asked him. He said, "Just do it". ... Anyway if you search on Youtube, you might find that very video.
(As far as I know, PS Audio vids are made by one of the founders of PS Audio.)
They are very under-stressed, mine only have one electrolytic on the signal path, looks new. Film caps practically live forever under Xover conditions.
Aged panels are far more important apparently (and expensive!)