I'm still on my 6+ so it's about 2 and a half years old. Would still be on my HTC M8 had it not become possessed. Curious to se how long fellow Gurus are keeping theirs.
Note 3, had it since I bought it here 2 years ago, no intention to upgrade at any point unless I break it or something sim only contracts, very liberating
Bought my Nexus 6 in December 2015 and still works great, although it's now EOL for OS updates, so anymore will be done unofficially. Can't say I'm tempted to buy anything else.
Samsung S4 Mini. It's now more than 3 years old. It's annoyingly slow, the battery is nearly dead, and of course it hasn't got updates for ages.
Get a custom ROM flashed from XDA, no doubt much more updated and a lot less bloat / quicker than stock
iPhone6Plus, using for 2 years and 6 months now. Working fine so far. It's my 1st iPhone, and I think snatched the best I could. HD resolution with nice specs. Hope to keep it for at least 3 more years. Costly thing better work back its price.
Galaxy S4 Qualcomm variant from 2013. Still has a decent display(FHD1080P) for these days standards, better than a good bunch of brand new phones. Running Super WizCyan custom ROM. Manages to reach 44K points on Antutu.
iPhone 6 16gb, I bought it a few monts ago from an old man in a MINT condition like 9.9/10. The guys seems to be really careful. Really happy with the device i hope it last a couple of years
Almost 2 years. I'm basically always waiting for things to start falling off before i get something else. My tablet is 5 years old, dslr is even older, and i even reviewed my computer case here in guru3d yeeeears back.