>>It's sad to see people again and again sell their life.

Why? I don't find that sad at all - some people really enjoy their work, and it becomes a big part of their identity. What better way to spend you life than doing something you truly enjoy and provides you an income to be comfortable and take care of your family/friends?

I know a lot of doctors, they have spent their entire lives taking care of people, saving lives and generally doing good things. Most of them have a very, very hard time retiring when the time comes - it is who they are. I know several in their eighties who continue to practice because it brings them joy.

While not an MD myself, if I won the mega-millions tomorrow, and was set for life, I would still write code for someone or something.