BTW it's real hard to hear the caps degrade 'cause it's so gradual but in something transparent ie hi-end hi-fi IME the timeline is 10 years. I have Naim and an '80s Onix intergrated (both SS) and the Naim after 10 years just got too dirty to tolerate. The Onix seemed decent enough till I recapped it, then holy shit! It's my hifi again till I get the money to service the Naim.
So, you've got 10 good years after that you'll have less good years, and with guitars amps you might not hear it for 30 years - but 60 year old e-caps