According to the introduction of "Open Sources 2.0" (which, helpfully, is online) Larry Wall has led the Perl community for "more than 20 years". According to perlhist, Perl 1.0 was released on 12th December 1987. I know which one I trust most.
Don't these people check simple facts? I know it's a small thing, but it would have been simple enough to check. And had they said "almost 20 years" I would have let it pass without comment.