Almost all U.S. population growth over next 20 years will come from immigration, and after 20 years, 100% will come from immigration.

Over the next three decades, the report predicts the U.S. population will rise from 335 million today to 369 million in 2052. The CBO forecasts that by the year 2043, U.S. population growth will be driven entirely by net immigration as the number of deaths in the country will exceed the number of births beginning at that time. The total fertility rate — the average number of children per woman — is expected to rise in the next three decades but will remain below the replacement rate, defined in the report as “the fertility rate required for a population to exactly replace itself in the absence of immigration.”

Source: Immigration will fuel US population growth in next two decades | U.S. News

And:

The population of seniors is expected to grow at a 1.2% rate per year over the next 30 years, while the population between 25 and 54 will increase at a much slower rate of 0.2%. Meanwhile, the ratio of people between the ages of 25 and 54 to the elderly is slated to shrink from 2.3 to 1 in 2022 to 1.7 to 1 in 2052.

These statistics could have an impact on the U.S.’s ability to maintain its social safety net for older Americans, Medicare and Social Security, with the number of people working to fund those benefits decreasing in the face of increased demand for the programs caused by a rising number of seniors seeking to obtain the benefits.

Coldstreams Skeptic