Bose is amazing for longevity. I'm still using a set my parents gave me when I left for college that they had for 10 years at least before that. They still sell the same model in stores today!
I had a set of Klipsch LaScala from 1960 to 1971 (since they had the "A-type" crossover) in college (in the mid/late 1990s); I don't think loudspeakers really go out of date in general. The crossovers might be worth replacing, but that's about it.