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At least it is dropping for young adults.
As the U.S. population ages, adolescents will represent an increasingly smaller proportion of the total population.
https://opa.hhs.gov/adolescent-health/adolescent-health-facts/americas-diverse-adolescents#:~:text=In 2019%2C there were almost,12.8 percent of the population.&text=As the U.S. population ages,proportion of the total population.