That probably depends on the industry. At my last job (embedded software for a defense contractor), I was actually the youngest at 28.
The guy to the right of me was in his mid 60's, the guy behind me was 50, and my boss was 52. I think the only other engineer not over 50 was this one guy who was in his late 30's.
It seems like in the defense industry, it's almost the opposite.
This has very much been my experience. I used to be the young guy. Now I'm the middle aged guy. I work with all kinds of developers older than I am all across the embedded software industry.The oldest guy on our team is in his 60s. It helps that tried and true technology which still underpins everything else (C, POSIX, sockets, serial comms) doesn't drastically change with every new hype and trend. Sure, it changes and will change but in units of decades. The next airplanes aren't going all Rust any time soon. And even cutting edge companies like Tesla/SPACEX need old school C programmers. And when/if it goes all Rust or something else, I don't think us old guys are going to have too much trouble switching over, and the ones who do can spend all their time maintaining legacy systems. In other words, I don't see how I (in my early forties) could outlive my usefulness.
The guy to the right of me was in his mid 60's, the guy behind me was 50, and my boss was 52. I think the only other engineer not over 50 was this one guy who was in his late 30's.
It seems like in the defense industry, it's almost the opposite.