The iPhone 7 was released on the 16 September 2016^[1], which marks the beginning of its update period. On the 12 September 2022, the iOS 16 was released, a next version of the operating system, which not made available for the iPhone 7, thus leaving iPhone 7 on the the previous version of the operating system, the iOS 15^[2]. This date marks the end of what we consider its update lifetime.

These two dates are 5 full years and 0 full months apart, which gives it AA- tier.