I’m almost 40. I can learn new programming languages just fine, thank you. And new languages/tech generally aren’t too hard to pick up once you’ve learned a few, for the most part.

They do a lot of the same things, just the incantations are different.

I do have more non-coding hobbies now and other responsibilities sucking up more time than when I was young, so I don’t have as much time to learn them on my own, but I still can and do learn them, especially if needed at work.