Only three weeks after the release of iOS 12, Apple's latest mobile operating system is already running on most iPhones and iPads. According to data provided on the developer site of Apple, now 53% of all iOS devices that have been launched in the last four years, the latest iOS version. If the dataset is extended to include iOS devices released before 2014, this assumption rate is still a respectable 50%.
The numbers will be even more impressive if we consider iOS 11. As shown in the image below, 40% of iOS users still use iOS 11 on current devices. Considering the cumulative number of iOS devices, iOS 11 usage is being reviewed for 39%. In short, 89% of all iOS devices are currently running an iteration of iOS that is about 1 year old at the most.
As a point of interest, iOS 11 adoption reached 65% about four months after its release. With the introduction of iOS 12 already at the 50% threshold, with a big refresh cycle coming up, it is clear that the launch of iOS 12 is well on its way to surpassing iOS 11 adoption ,
The above iOS numbers are all the more impressive when we look at what's happening on the Android side. The Android Developer Dashboard is still running more than 50% of all Android devices running Android 6.0 Marshmallow or earlier. In other words, most Android devices run a mobile operating system that is at least 3 years old. Overall, Android adoption has apparently gotten better in recent years, but it's still fading compared to a new iOS version.