Constant worry about ageism, discrimination, and making a living once you to get to late 30s/early 40s. In particular SV but this is a concern everywhere. What

Constant worry about ageism, discrimination, and making a living once you to get to late 30s/early 40s. In particular SV but this is a concern everywhere. What can you do then if you love programming and don't want to be a manager? It's just terrifying.