Good quality poly caps can last for decades...especially in a passive circuit. Inductors, resistors, and wire, even longer. Woofer surrounds can rot if they’re foam, but the butyl rubber ones last decades too.
If the tweeters have ferrofluid, that can dry up every 20-25 years or so, but can be cleaned out and refreshed.
I suppose gravity can do it’s thing to the suspension over time, so can’t hurt to rotate the woofers in the cabinet 180 degrees every 20 years or so if the speaker wire leads are long enough..
My speakers are 33YO, showing no signs of giving up.
Wish you all the best with your health.