It’s changing, as Timothy Taylor reports.

In 2012, the typical workers [did not] reach the median level of earnings until age 30–four years later than their counterparts in 1980. And in 2012, while wages still drop off when people reach their early 60s, the decline is not as rapid or as far.

He cites a study by Anthony P. Carnevale, Andrew R. Hanson, and Artem Gulish.

From a PSST perspective, it makes sense that as the economy grows more complex it takes more time for young people to arrive at their comparative advantage. But there are no doubt other things going on as well.