IF you plan on keeping speakers for a very long time, very long time, (as I have done/will continue to do) you need to think about driver replacement, and woofer cone or cone/coil replacement.
My 15" woofers, paper cones, are from 1958, Electro-voice 15W, 16 ohm. (it’s brother 15K was in the mighty Klipshorns) The cone has pleated paper surround, not foam like modern drivers. Beast weighs 37 lbs.
From eBay: here’s a paper one with damage
here’s a modern 15" with typical foam surround. some people might try to put a 15" paper cone with foam surround in place of the original type on the 15W.
Here’s a proper pleated paper cone/coil kit. At some point they will disappear from stock.
Over the years, I have had a pro replace coil/cones once; I replaced coil/cones once (if you are handy, the instructions on-line make it easy). and I have 1 spare woofer and one spare cone kit.
The electro-voice tweeter and mid horns, phenolic coated linen, are essentially indestructible, however I have a set of replacements just in case.
Crossovers are in a tar filled metal can. Professional crossover people told me to leave them alone. I have 1 spare crossover.
Level Controls, L-Pads, are 16 ohm, just replaced them last year.
IOW, you can’t just sit around listening with a perpetual smile on your face, thinking they will last forever, you need to plan for refurbishment.