Way above 40 —- I started programming as a job 40 years ago. Now I freelance, busier than ever. I don’t usually work surrounded by younger programmers. I lead and mentor a small number of younger programmers but generally they have a decade or more experience.
I mainly do web app development (I would call myself “full stack” if that meant anything, I do front/back/database) and a lot of system admin, mainly cloud deployments these days. I don’t jump on the fad bandwagons but I do keep up with new things.
I stay motivated getting paid well. Sometimes I find the work interesting and fun, though rarely especially challenging. I like working with people and helping businesses solve real problems (as opposed to “tech” problems created by programmers).