A 76-year-old man was convicted by a jury last week of sexually assaulting a young girl in 2018. Joseph Jackson, of Pennsauken, was found guilty of two counts of sexual assault and another two counts of endangering the welfare of a child on Friday, the Camden County Prosecutor’s Office said in a news release. Jackson was arrested on March 5, 2019, on allegations that he sexually assaulted a nine-year-old girl, officials said. The assaults reportedly occurred at Jackson’s home in Pennsauken as well as another location in Riverton, Burlington County, prosecutors said. His sentencing is scheduled…