Eagles were big starting in 1971. That's getting really close to 50 years ago.
People in their prime at that time are now 70 to 80 something. It's only natural.
I do lots of Eagles songs. No Kiss though.
Credence Clearwater Revival is even a little older. Love everything they did.
If I were in a nursing home today, I would not care to hear music from the 30s or 40s. The good stuff for me starting in mid 50's.