You can say they never die. They only become untouched "legacy" technology waiting for a forklift upgrade. Million dollar mission critical perl hasn't changed since the early 2000s, see this thread http://www.nntp.perl.org/group/perl.perl5.porters/2011/09/msg177543.html . You'll always find one token place that has a server room filled with aged almond colored plastic and the place is like an egyptian tomb of technology. Perl is damn fast for writing code though.