American Demography: Mostly Hopeful-ish

According to an op-ed by David Brooks:
Over the next 40 years, demographers estimate that the U.S. population will surge by an additional 100 million people, to 400 million over all. The population will be enterprising and relatively young. In 2050, only a quarter will be over 60, compared with 31 percent in China and 41 percent in Japan. 
. . . The American fertility rate is 50 percent higher than Russia, Germany or Japan, and much higher than China. Americans born between 1968 and 1979 are more family-oriented than the boomers before them, and are having larger families. 
. . . half the world’s skilled immigrants come to the U.S. As Kotkin notes, between 1990 and 2005, immigrants started a quarter of the new venture-backed public companies.