https://www.mercurynews.com/2020/07/30/three-charts-explain-who-is-dying-as-california-tallies-record-coronavirus-deaths/

We’ve known since early in the pandemic that age is a major risk factor for becoming severely ill or dying from COVID-19. Those disparities are becoming more stark as quarantine fatigue and economic reopening has spurred more infections in younger age groups, but the recent spike in deaths is still spurred mostly by our elders.

This chart above clearly shows  that some of the younger adult age groups are infected more frequently than children or older adults, who make up a smaller portion of the population, but older adults are still the majority of deaths.