Lifespan of speaker crossover components & drivers

Hi folks, this is my first post here. Briefly, a bit of background. Bought a used pair of Audiophysic Virgo mkIII around three years back. Enjoyed them for two years and then decided I needed the money and sold them (ironically to the same person who sold them to me - he'd missed them too much!). I spent a year 'slummning' it with lesser speakers but finally decided I needed the AP sound and bought a mint, year-old pair of Avanti mkIII in cherry two weeks ago.

I am delighted with these speakers and I think these are the ones for the long-term commitment.

What I want to know is what a reasonable expectation for lifespan of crossover components and drivers is. I've read that caps can dry within 15 years, depending on the type, and of course I've heard of a lot of speakers from the 70s and 80s with driver degradation (primarily 'rot' of the surrounding mounts).

I'm hoping to have a long and happy marriage, cough, I mean ownership with these speakers - and I'd be keen to know when I should be looking to have things like the crossovers re-capped.

Any pointers appreciated!