I have a Samsung Galaxy Note II, that I have had since 2012.
It still works relatively well, but the battery has been having issues for a while and it locks up occasionally, (DHs phone locks up a bit more frequently). However, full disclosure, we tried to upgrade our phones last year to the Note 7s, which, you may recall was a bit of a disaster. My DH was so disappointed, (he is a new tech gadget guy), but I actually managed to convince him to keep our old Notes until the next one is released. So now we are both limping along waiting for the release of the Note 8, which now appears to be around the time of our vacation (again) which means that he will want to upgrade before we go, while I would rather wait, since I think that taking a brand new phone is a recipe for disaster and if I lose or destroy a phone, I would prefer it to be the old one.