Most of the overall population growth, 82 percent, will be the result of immigrants arriving between 2005 and 2050, as well as their children and grandchildren.
Other findings include:
- The number of working-age adults, ages 18 to 64, will rise from 186 million three years ago to 255 million in 2050.
- Foreignborn adults will account for 23 percent of the population in 2050, while non-Hispanic Whites drop from 68 percent to 45 percent of the group.
- The nation's population of seniors, those 65 and over, will more than double in size to 81 million by 2050. The last of the baby-boom generation will reach 65 in 2029. That combination will add up to 32 seniors for every 100 working-age adults, up from 20 in 2005. For every 100 working-age adults in 2050, 72 people will be either seniors or young children, , up from 59 in 2005.
- Pew researchers project that by 2050, the nation's population will total about 438 million, as long as today's immigration, fertility and other population trends continue.
