Haskell is still a very dynamic language - there is still much room for it to grow and improve. In that sense, it is still young.
Perl and Python and Ruby have hit middle age - no more growing, just more bulk accumulating around the middle.
Or in Perl's case, a seriously ambitious redesign: http://dev.perl.org/perl6
Note that among the features being added are lazy lists, generators and currying, to add to the stuff Perl 5 has which lets you do sort-of-functional programming. Haskell gets mentioned fairly often in some of the discussions, but that might be because I'm the one who keeps mentioning it :-)
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