A 53-year-old man has been charged with sexually assaulting vulnerable octogenarians, including an Alzheimer's and a Parkinson's patient, over a 17-year period, a media report said.

Delroy Grant, a married father of nine - dubbed the Night Stalker - allegedly conducted a planned series of rapes, sexual assaults and burglaries targeting both men and women, most of them in their eighties, the Daily Telegraph reported.