24 percent of the people treated at the HSE's Sexual Assault Treatment Units last year were under 18.
According to the service's annual report, 20 victims were over the age of 55.
734 patients were treated in the HSE's six sexual assault treatment units in 2020.
277 were seen in the Rotunda Hospital in Dublin, with the next highest being 111 in the South Infirmary Victoria University Hospital in Cork.
The units in Mullingar, Galway, Letterkenny and Waterford all saw at least 78 patients each.
In total, 92 percent of the victims were female, and 8 percent were male.
12 victims were less than 14 years old, 77 were aged between 14 and 16, and 87 were between 16 and 18.
Six were over the age of 70.
9 percent of the assaults were committed by multiple attackers.
Main Image: FILE PHOTO: HSE Logo. The Health Service Executive (HSE) sign at the organisation's HQ in Kildare. Photo: Eamonn Farrell/RollingNews.ie
