My iPhone 4, 8 years old and still going strong
I bought it on the day of release 8 years ago: June 24 2010.
I’m not against getting a new phone, I’ve maintained that I would simply get an update when this one dies on me or is no longer functional on a day-to-day basis.
It’s been working perfectly ever since. Even the battery life is fine. iOS is 7.1.2.