30 yr old speakers- time to replace drivers?

@pureclarity sorry, I missed the problem statement in your OP! do you hear distortions, or any kind of sound problems' to fix? If not, why to “fix” anything?

Speaker design (fix) can be very challenging, and needed some assessment, x-over sims, measurements etc, not available to everyone.

The Xovers are totally worn out ,having upgraded Xovers a long time the capacitors dry out for sure after 15 years or less , you loose detail and then uneven output per speakers ,then just stop working.

I agree, I would not put money into a thirty year old speaker. There have been huge improvements in every aspect of design.

Crossovers can last waaayyy more than 15 years. Hell I just sold a 50 year old sansui 9500 that would put the majority of integrated amps under 5k to shame. I know it’s not a speaker. Original caps other than a few small input caps replaced. If there’s nothing that sounds “off” I wouldn’t mess with it. 
 

upstairs system has original Paradigm Studio Monitors. Same thing 30 years old sound awesome, lacking no where compared to my main system downstairs. 

That said I am also with others if they need some work I would not put much into them if anything.