[CuriouslyC]

If you're smart about what you learn and what jobs you take, you can build a skill set that will keep you in demand forever. If you just spend 20 years building boring crud apps using the hot stack du jour, of course you're going to have problems.

[ZeroFries]

Any advice on how to do this?

[CuriouslyC]

Always try to make your next project more ambitious than your last. Look for opportunities to incorporate challenging features into boring products, and ask your employer to let you work on progressively harder things.