Assuming by education you mean formal schooling: Consider that wealth is accumulated over time. While outliers certainly exist, the older you get, the more wealthy you are apt to be, at least to the point when you retire and start to use those reserves to live on. Also consider that in 1970s, the time when the boomers started coming of age, having 'high school or more' was reserved for just 50% of the population. Only a mere 25% for the oldest segment of the population. It has steadily climbed to more than 80% for the youngest adults. But they, statistically, haven't had time to amass a large amount of wealth yet.