I don't think Apple has any official "at least X years" support but they're generally pretty good about it. iOS 15 will be on the iPhone 6S when it launches thi

I don't think Apple has any official "at least X years" support but they're generally pretty good about it. iOS 15 will be on the iPhone 6S when it launches this year, which will be a 6-year-old device at that point.