I have a GeForce GTX 970 from 2015 that's still doing sterling service every day in my recently refreshed HTPC, delivering 4K movies and the occasional game to my 65in Sony OLED TV. My best tech buy ever.
I just gave mine away, like an hour ago. I recently upgraded my hardware so I listed the old 970 for giveaway since it has very little market value nowadays, and this guy showed up for it, turns out he's the pilot at a nearby scuba centre, and he told me I got a diving session in exchange for the card. Good business
My 970 made it until the end of the crypto boom and GPU shortage. I got a GPU shortage special 2060 that was manufactured after the 30 series release to replace it with