nothing too old...I usually get rid of them when I get a new one. The Panasonic FZ35 was my first superzoom and that was gifted to my wife, so I'll count that since it's still in the house. I think it's from 2009.
I've had a lot of gear turn-over the last 4 years trying to find what works best for me. My oldest is the Pentax K-1, will be 3 years old mid-May. As soon as a relatively local store had one, I went to look at it. After getting it in my hands, I paid and walked out the door with it. It just fits.