Anything meaningful takes five years to do, whether that’s getting a company off the ground or mastering a skill.If we start working at 20, that’s 60 productive years — or 12 five-year blocks to do new things, then move on.Instead of living one life or career, why not live a dozen instead?This ebb and flow of interest and desire feels natural to me... See more

One of the main things you should try to achieve by age 20 is some sense for which kinds of things you enjoy doing. This probably won't change a lot throughout your life and so you should try to discover the shape of that space as quickly as you can.