Oldest piece i have would be a Yamaha P-350 turntable I bought when i was 14 (1977). So it’s at least 48 years old and I bought it new. Nothing high end about it, but it is my history, nostalgia kept it in a box in the cellar for 35 years. Even more important, it got me back into HiFi when my 14 year old daughter asked me "what’s a record?". Dug it out, refreshed it a bit and been going/operational since (but does now play second fiddle to a newly acquired Sony PS-X50 TT).
Thanks kid.