What about people who don't earn enough? You can build capital by making investments or even saving if you have a family to feed and also have a very small income which is barely enough for your personal expenses, a person in such a situation cannot build capital or develop one since they can't create one in the first place. The very first thing for a person is to be able to earn more than they need to spend because if you can't even spare a dollar, you can't build your future.

However, those who have enough resources to do that should obviously follow some pattern and get things done right in their lives before it's too late. There is a specific age for doing something, once you miss that age and enter an age where you can't do anything, you will regret wasting your youth.