I have an iPhone 6 Plus that's going on 4.5 years old and it's doing fine (better than last year even with iOS 12), save a temperamental ring/vibrate switch. I

I have an iPhone 6 Plus that's going on 4.5 years old and it's doing fine (better than last year even with iOS 12), save a temperamental ring/vibrate switch. I recently sold my 4s that was in a drawer (about 7 years old at the time) and it also worked fine.