I took C and C++ off of my resume years ago even though I did both for 12 years and I still know all of the ends and outs of C. There is going to be that one old geek (I’m 45) who wants to ask me some obscure question just to prove how smart he is. I definitely leave PHP and Perl off. I don’t want to show up on recruiters search results looking for WordPress developers (I never did WP).
I want to keep the conversation and the interview focused.