Answer by Dan Kanivas:
99% of Warren Buffett's wealth was earned after his 50th birthday.
At first glance, this fact doesn't seem to make any intuitive sense. How does an 85-year-old who has been investing since he was 11 make essentially all of his wealth after age 50? Were the first 39 years of his investing career just wasted?
This is just the nature of compounding over long periods of time. We humans have a poor intuitive grasp of how compound interest works over long time periods, and so this fact seems like it can't be true. But for Buffett, this was anything but fantasy. Because he understood the math from an early age, this was essentially a preordained outcome for him.