The preamp board in my 83’ G&L L2k lasted 30+ years, got a used replacement for $25. I’ll call that the lifespan. They aren’t exposed to heat or water under ordinary circumstances, I guess the caps can go bad eventually.
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Yeh, that tilt-cavity on MM basses puts strain on the contact cap. Have had to repair a couple of them.IME, battery clips are one of the most common failure points of active bass circuits. As others have said, pots, jacks, switches too. As for the circuit itself, yeah electrolytic caps older than 20 years should probably be replaced, but modern electrolytics should last much longer than this. If the board is exposed, I'd check the circuit tracks and solder joints with a high magnifier for signs of corrosion, dry joints etc. Having said this, I've once or twice come across a track that looks fine, even with the magnifying glasses and has a perfectly shiny solder joint at each end, but won't pass current/signal. So yeah, 20+ year-old single-sided boards can be problematic too.
My oldest one is 15 yrs old and has seen regular gigging - no problems thus far. As I understand, the most common issue is with the contact lugs which simply have to be bent back correctly. I've only ever seen one disconnect from its wiring and that was caused by someone's disgruntled ex girlfriend unscrewing the box and yanking it out (largely in frustration because the bass was so strong nothing significant would break off it!!!)Yeh, that tilt-cavity on MM basses puts strain on the contact cap. Have had to repair a couple of them.