Apple has unparalleled support for older devices, I think we agree.
For operating system updates, Samsung pledged 4 years of updates for the flagships starting with S21.
The difference between Android versions isn't big. I also mentioned in another comment that on Android, to cope with phone makers not pushing for system updates, Google can update many system components via Google Play. And apps remain compatible. Being 2 versions behind the latest Android is OK.
For reference, the latest version of iOS will run on 5 year old iPhones when it is released.