You're right, he looks late twenties at most! Here's a video of him: http://www.destructoid.com/pax-east-valve-s-josh-weier-talks...

I watched the whole thing and I just can't believe that.

I'm almost completely certain this is a joke. He's probably in his late 20s.

This must be an in-joke. Best thing to do is respond the same way you do when you hear an in-joke at the new job: laugh along and then hope you overhear a conversation where someone explains it.