At least for Linux (and some *BSD) based OS distributions, https://www.distrowatch.com/ lists versions of major included packages (including perl). If there is a particular distribution in use at the client location, then this might be of help.

For the top 21 distributions viewed on their site in the past six (6) months, the perl version breakdown for the last two (2) (or so) releases is as follows:

Hope that helps.

In reply to Re: Out-of-the box Perl version - lowest common denominator by atcroft
in thread Out-of-the box Perl version - lowest common denominator by kcott

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