The longest you have owned any gear?

I'm still using the McIntosh MR-80 tuner that I bought new back around 1980.

My 1st cd player, a Sony ES, from 1988 to 2004.

Ahh, this thread is right up my alley!

Back in 1990 put together a 2nd system which included a Counterpoint SA-5, BEL 1001, and Spendor SP-1's. Today the Spendors, and the BEL still are in use in my main rig. For full disclosure however, they will be challenged soon.
Also have a Well Tempered Classic bought new I think in 1986 that I have stored away since 1995. Does the Well Tempered count?

   LP

Sony CD15ESD 10 disc changer purchased in 1987. Still going strong.

I finally gave away my ESS speakers I bought in 1977. My friend still uses them after replacing the woofers.