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.
It is true that in this world not everyone is in good shape financially. Because there is still much that we can find about people who have only enough income to meet the needs of their families. And it is difficult for them to leave money for capital. So they do not even have the opportunity to develop capital. Because even they do not have any money left that can be used as capital. The solution in conditions like that really only has to have a side job and make more money than usual. Maybe it will reduce the rest time but if you don't do side jobs then it is not easy for someone who only has a mediocre income to be able to get up and improve their finances by gathering capital from side jobs and developing it.