In a +1 score to #Perl's great back-compatibility, I've had a script called from procmail that's been 100% reliable for the past 15 years maintaining my email, over many years of regular Perl updates.
@pjakobs I mainly manage different #Perl versions with #asdf (https://asdf-vm.com) to test code that has to run in less upgradeable environments elsewhere. $work, for example, susbscribes to #Canonical's #Ubuntu Pro so we're on Perl v5.34.0 of their 22.04 LTS #Linux distribution (“#Jammy Jellyfish”).
But like @leonerd, personal stuff is on the latest.