60+ become candidates because of accumulated wealth, accumulated critical mass of professional and political connections, and a bit of end-of-life ego.
As for what old STEM people do, my father started to learn C++ at 66, learned Python at 68, modified and invented variations of heat pipes for energy efficient home cooling, designed and built a home-brew control system (before weenie arduino stuff), mastered the art of the perfect grilled pork burrito, and learned to play jazz clarinet. Really miss that cranky old geezer. RIP, Dad.
As for what old STEM people do, my father started to learn C++ at 66, learned Python at 68, modified and invented variations of heat pipes for energy efficient home cooling, designed and built a home-brew control system (before weenie arduino stuff), mastered the art of the perfect grilled pork burrito, and learned to play jazz clarinet. Really miss that cranky old geezer. RIP, Dad.