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.