It's crazy to think that any programming language is that old.
Modern Fortran is very different from early Fortran. If it wasn't for the name you wouldn't think they're the same language.
As someone who has been programming for nearly 50 years of it, it seems less remarkable.
I don't see why. LISP is just a year younger and COBOL is 2 years younger. And Algol, spawned a year after FORTRAN, is no longer used as such (although there is now GCC support for Algol 68) but spawned many "Algol-like" languages, including most of the languages used today ... and even modern Fortran can be considered "Algol-like", having evolved to include its block structure.
FWIW, I started programming in 1965, in FORTRAN II.