The longest you have owned any gear?

Still my TT. Purchased in 1983. Responded in 2017. 

My current gear:
Cary 303 CD player I have been owning since 2001.
Altec 604E speakers since 2005.
EMT 948 turntable since 2011.

ROWLAND 8T 12 years it is still a classic amp.

I've own my Acoustat Spectra 33 electrostatic speakers since 1988, 33 years. I use them for maybe a week or two every few years.

I still own and play from time to time my Yamaha NS1000. I bought them new in 1978 in Emporia KS. They still sound fantastic. In fact I just recently took them out of my system and re-installed my Tyler Acoustics Woodmere II. I switch back and forth once or twice a year just for fun.