Still running my Thorens TD-166 MkII, purchased new in 1984 (now somewhat modified).
Also still have my Advent New Large Utility speakers (recently restored by Millersound) in a secondary system. Got these in Febuary, 1978, as an early High School graduation gift.
Oldest accessory would be my Discwasher record brush, which I think I purchased sometime around 1976 or 1977. I don't use it often these days, but I still have it.