Bar chart showing the distribution of health care spending across enrolled population in 2020, by age group. Those under 18 years old make up 24% of the enrolled population, yet represent 12% of total health care spending versus 25% of spending on mental health and substance abuse. Those between 55 and 64 years make up 15% of the enrolled population yet represent 27% of total spending and 11% of spending on mental health and substance abuse.