My main (wired) headphones are 15 years old now, with zero degradation. My headphone amp, turntable, and CD player are roughly the same age or older. I have no

My main (wired) headphones are 15 years old now, with zero degradation. My headphone amp, turntable, and CD player are roughly the same age or older. I have no plans to get rid of them anytime soon. My parents haven't passed any down to me, mostly because they're still alive and using their own stuff, but my dad listens to music on speakers he bought in the early 70s. (I don't think my grandparents were ever serious about HiFi equipment, so nothing really to pass down. Half of them are also still alive.)