Your oldest gear?

My Trio W-41 integrated tube amp is 62 years old. I refurbished it 6 years ago. 

My ears are 4 years younger.

Oracle Delphi mkiii, 1987. Owned longest, a pair of Monarchy SM70's. Owned for 30 years, I think. Both operating in my current system. 

I owned Carver HR-772 Integrated amplifier for 35 years.  Had it recapped about 5 years ago.  An amazing amp.  But, I eventually replaced it with a BHK250.

Also owned Klipsch Tangent 40s for 34 years.   Those were also great.   Eventually replaced them with Klipsch Heresy IVs and a pair of Rel S/510s.

Teac X-10R r2r, dbx 224 Type II noise reduction system, and dbx 3bx range expander purchased in 1982 from an auto club while stationed in Germany. A few years ago, I gave my stepson my Technics SL-1200 TT, Pioneer SPEC 4 power amp, and Rodec DJ mixer purchased around the same time. 
 
With a little TLC and professional care, everything is still going strong. I will say, the old SL-1200 TT sounds no where near as good as my SL-1200G 🤭. 

In my main system it is a pair of Martin Logan Sequel II's with an Aragon 24K Preamp with phono stage. I've owned these since they were new in about 1992. In my basement I have my original pair of New Large Advent Loudspeakers, from ca. 1976. they were re-coned a few years ago and sound so great that I'm considering having them re-laminated with a high-end wood veneer. I currently have them driven by a FatMan iTube valve amplifier that puts out just 13WPC, but casts a huge soundstage!