It’s fairly different for iOS, where base OS requires at least yearly updates to keep up with the times (and at least with iOS 10 such update was very late).
And even then you don't always have to update for each new iOS release unless you intend to make use of new features.
I had an app on the AppStore for 3 years without updates before Apple said 'this app needs updating or we will remove it from the Appstore.