(Spokane Valley, WA) -- Spokane County sheriff's deputies say an 85-year-old man is believed to have sexually abused children since the 1950s. Authorities say Marvin E. Petersen was taken into custody last week after a number of alleged victims, including family members and neighbors, were interviewed by investigators. The Spokane County Sheriff's Office tells the "Spokesman-Review" the alleged victims were between four and 13 years of age when they were abused. Bail for Petersen is set at 100-thousand-dollars, and charges against him include first-degree child rape, child molestation and unlawful imprisonment.