I think there is a great message here. Most entrepreneurs I speak to believe that they must quit and start a company as soon as possible (early thirties?) or else they will never be able to start one.

I think this is a fallacy. My dad became an entrepreneur in his early forties and many other much later. It is not really a matter of age anymore in modern societies. It is about how sharp you keep yourself as you age.

Probably if you are a startup kind of person (as opposed to sustaining a company kind of person), you would be starting companies even in your nineties. It is never too late. It is just how old you feel.