Thanks for bringing up Fortran 77. Lots of F77 code is in use today through R and SciPy bindings etc. -- millions of users every day, thousands of compilations

Thanks for bringing up Fortran 77. Lots of F77 code is in use today through R and SciPy bindings etc. -- millions of users every day, thousands of compilations every day. Just because new code is not written in it, it is very much in use, nobody wants to rewrite solid code that has stood the test of time. The word you are looking for is "deprecated", not obsolete.