I'm not ancient but I am 39 and have been doing web programming for many years, going back to the days when PHP was popular. I switch over to primarily JavaScript and Node.js around 6 years or so ago.
To all the haters, there are very practical reasons I started using Node on the backend years ago. Trying to build a collaborative real-time web application with Twisted and whatever was a huge pain. With something like Node.js its much more practical because you get async and isomorphic (same codebase on client and server).
Point being, JavaScript has been a big deal for quite a long time, and it hasn't taken _all_ older developers up until just now to catch on.
And now we are actually one or two trends removed from that initial wave of popularity. Plenty of the young guys who basically wrote the book on Node.js and created the most downloaded-ever npm modules moved on to Go or whatever years ago. And plenty of them decided to move on to Rust (or a few picked up Nim if they are smart).