My ADS L1590 speakers were purchased new by me in 1984. They still sound wonderful. Unfortunately they haven’t gotten any smaller over the years. About 100 lbs. each. :-(
I also have some small Boston Accoustics speakers from the 90s (one pair was second hand). They still sound fine.
My guess is that aside from abuse it’s the environment that has the biggest impact on longevity. High humidity, temperature extremes, and physical impacts, small children, and so forth probably degrade the drivers and crossovers more than just time and use.