I was watching a couple of videos - one where a guy had a rack full of old preamps and effects from the 80s and 90s from the ADA MP-1 to the Peavey Rockmaster etc. and another on Premier Guitar of Mutoid Man and the guy was using an 80s Aria V and a Sunn amp.
All this stuff is out of fashion and outdated but they were getting cool sounds from all of it.
It got me curious as to what everyone's oldest piece of gear is that you actually use - guitar or amp or effects. For me it's my Peavey T-60 with Duncan 59s. Still sounds good and full especially with the Duncans in it. I recently got rid of an MXR Distortion II from like 1982. I hadn't used it in a long time but it's a cool tone.