Perhaps you have this forum confused with Reddit. By my estimation, everyone here is over forty, either in body or in soul, and by way of particularly cringeworthy example the correspondent you most unfortunately chose to rag on was already a computer scientist of international note twenty-five years ago. Many, if not most, of the designers of the new programming languages and paradigms under discussion are of similar breadth and depth of experience.

There is no monopoly on the grumpy old fart act; there is only a difference in their willingness to continue pushing back the boundaries of ignorance.

All of which is notwithstanding the necessary and essential vigour of youthful perspectives, c.f. Seymour Cray’s notable preference for working with recently graduated engineers both for their energy and their fresh ideas.