If you want to talk about things that have been around for years, you really should go much further back. Lisp (functional) has been around for a very long time. OOP has been around a long time too, starting as lisp atoms. FP isn't new, but it's gaining popularity.
We're already at the age where everything old is new again with computers, but each iteration brings improvements. The tools to program with OOP and FP have come a long way, and the abstractions we're capable of now are definitely better.
There is a lot more to functional programming than what's in this post, of course, but the essence of passing functions as values is one of its pillars. Another pillar that wasn't covered (you can't cover everything in one post) is that you need your functions to behave in a predictable manner, such that repeated calls with the same parameter will return the same value, no matter how many times you call it, or in what order.
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If you want to talk about things that have been around for years, you really should go much further back. Lisp (functional) has been around for a very long time. OOP has been around a long time too, starting as lisp atoms. FP isn't new, but it's gaining popularity.
We're already at the age where everything old is new again with computers, but each iteration brings improvements. The tools to program with OOP and FP have come a long way, and the abstractions we're capable of now are definitely better.
There is a lot more to functional programming than what's in this post, of course, but the essence of passing functions as values is one of its pillars. Another pillar that wasn't covered (you can't cover everything in one post) is that you need your functions to behave in a predictable manner, such that repeated calls with the same parameter will return the same value, no matter how many times you call it, or in what order.