It will never be too late to "invest" because the scarce nature of Bitcoin means that as long as people have needs and wants, they will need to produce things to make our lives better and we will need money to pay for things.

The population isn't slowing down. More and more people are going to need bitcoin and the supply isn't going to increase as much as the population.

The price of bitcoin is designed to go up forever. It's never too late.