How many teens you think can actually read and understand legacy languages like FORTRAN and COBOL? Let alone a complex codebase written in them?

I studied COBOL a bit in college and it's not exactly hard to read short snippets if you understand other languages, but good luck wrapping your head around anything remotely complex and actually understand what it is doing without having someone who understands the language. Hell, 15-20 years on and multiple languages later, my eyes still cross trying to read and grok COBOL. The people supporting those old code bases get paid well for a reason ...