I've had Perl change its syntax on me and break my pet monitoring system too often to make me feel good about Perl. It hasn't been too hard to keep it running (20 years so far), but starting fresh I'd probably use Python.

Python is much cleaner code than Perl for the most part as well.

However, for anything that should run forever, make sure you have a copy of all of its source code AND its libraries AND the source code for it's compiler. Repo rot is a serious problem over time.