COBOL is what gets a lot of people paid and probably underpins far too much in govt and larger companies. It’s rumoured to be the reason IBM keeps binary compatibility in their mainframe line as “they lost the source code long ago.” Supposedly, it’s a meal ticket for mostly old fart consultants.

FORTRAN, on the other hand, is used to melt compute clusters while trying to make things go boom, or model micro- or macroscopic properties to design various things. Damned language still optimizes or runs large scale better.

As you all know, few pay to rewrite code that works well.