> Meanwhile, I'll likely be seen as a dinosaur in tech by that age and will be lucky to find work at all

My dad is in his 60s and is still doing cutting edge work on Kubernetes, Golang, eBPF, etc in a big tech company in the Bay Area. It honestly isn't that hard to keep yourself up to date with technology looking at his experience.

If you can't get yourself interested in upskilling or learning the next new paradigm you're in the wrong field.