No, the norm on the iOS is current and two versions back. It is also worth mentioning that iOS are usually supported for much longer than Android. iphoneOS 15

No, the norm on the iOS is current and two versions back. It is also worth mentioning that iOS are usually supported for much longer than Android. iphoneOS 15 will be supported by iPhone 6S: this was released in 2015. If app supports iOS 12 (which most do, as it is only one version below the current iOS 13) it means they support iPhone 5S: which was released in 2013. And Apple users are likely to update: 92% run the latest version, and 7% are on the iOS 12.