iOS 12.x has continued to get security releases, as recently as 12.4.8 a month ago (https://en.wikipedia.org/wiki/IOS_12#Updates https://en.wikipedia.org/wiki/I

iOS 12.x has continued to get security releases, as recently as 12.4.8 a month ago (https://en.wikipedia.org/wiki/IOS_12#Updates https://en.wikipedia.org/wiki/IOS_12#Updates). If you bought a 2014 iPhone 6 in 2018 it's still being maintained today in 2020.