Statistics have been reported for both directions.
Early US data[1] showed:
* 20% of (COVID-19 patients hospitalized) were age 20-44 years.
* 12% of (COVID-19 patients in ICU) were age 20-44
The same report also tallied result by age group, stating that:
* 14-20% of (COVID-19 patients age 20-44) were hospitalized
* 2-4% of (COVID-19 patients age 20-44) were in ICU
Ranges due to not all data sources reporting hospitalization/ICU status.
[1] https://www.cdc.gov/mmwr/volumes/69/wr/mm6912e2.htm