The Pixel 4 was released on the 22 October 2019^[1], which marks the beginning of its update period. On the 4 October 2023, the Android 14 was released, a next version of the operating system, which not made available for the Pixel 4, thus leaving Pixel 4 on the the previous version of the operating system, the Android 13^[2]. This date marks the end of what we consider its update lifetime.

These two dates are 3 full years and 0 full months apart, which gives it B- tier.