I disagree, the energy you have at that age is unparalleled. If you spend it on entrepreneurship, your chances of success are much higher. People consistently underestimate what it takes to build an innovative new company, young very bright people can do it. If they wait til 25/30, they will have lost some of the spark required. It can also take a decade, so start at 25, you are looking at success by 35. Start at 19, by your mid 20s you are in a very good place.