Actually Lisp was invented in the 50's.

In fact Lisp was the first interpreted language built. Literally they were developing it, and had a manual process for turning Lisp into assembly. Someone wrote 'eval' in Lisp. Someone else noticed that it would be really neat if you translated that into assembly, and away it went!

Programmers associate this stuff with the 70's because that was when the first mainstream programming langauges that supported recursion (like C) became popular.