Question about caps in vintage power monoblocks

Folks,

If a pair of vintage power monoblocks (produced in mid 80s) was kept in storage for the last 15 years or so with less than 100 hours of use - would the capacitors continue to deteriorate while in storage at about the same rate as if one was continuing to use them or would the damage/drying of the caps slowed down/stopped once they were put in storage?

Thanks!