In terms of age, my FDD is the oldest. My 8X CD-ROM was 2nd oldest until I exchanged it for a 24X with a friend. Ironically I've been through >4 monitors(14"->15"->17"->21"->21"😉 and 3 cases(currently 6896A), but I expect my current 445Xpro and 6896A to last for a while.
Oh, my Yamaha DB50XG has been around me for 4 years too, and I just picked up an old IBM Model M to replace my original damaged Model M, I expect to be using that forever too.