166 million Americans under the age of 40 -- millennials, Gen Z and younger generations -- make up 50.7% of the population

It's official: millennials and those in the younger generations now make up more than half of the US population.

The data, which was released by the Census Bureau last month and analyzed by the Brookings Institution, reveals the 166 million Americans under the age of 40 -- millennials, Gen Z and younger generations -- make up 50.7% of the population, as of July 2019.