Which of the following is true of the demographic projections for the United States?

The most rapidly growing segment of the population will be those older than $85$ years.

The baby boomer generation will have an effect on the number of elderly in coming years.

The United States is expected to have a relatively similar number of individuals in each age group in coming years, as compared to either developed countries like Japan or developing countries like Nigeria.

All of these are correct.

Immigration tends to increase the number of young people in the population.