The following data is extracted from A History of the Pioneer Families of Missouri - Warren County.
Aaron Young was married in 1804, to Theodosia Winn, of Fayette Co., Ky., and came to Missouri and settled near Marthasville in 1819. His children were James, Martha, Elizabeth, Leonard, and Mary. Mr. Young served as County Judge for several terms, and finally moved to St. Louis County, where he died. Benjamin Young was born in Fayette Co., Ky., in 1791. He married Mary Maaro, and came to Warren County in 1819. He settled at Marthasville, and opened a store, being the first merchant of the place. In 1820 he removed to Callaway County and settled in Ham's Prairie, at a place called Elizabeth, which was the first county seat of Callaway County. In February, 1821, he was appointed the first County Judge, by Gov. McNair, which office he filled for a number of years with credit to, himself and the county. Mr. Young was a man of superior talents, and represented Callaway County in both Houses of the State Legislature for a number of years. He was also a member of the Constitutional Convention of 1845. Unfortunately he had an impediment in his speech, and always had to go through a certain formula before he could speak, which was as follows: 'Be-kase, be-kase, be-kase, sir, by g-d," at the same time advancing with a short hop at the utterance of each word. He was married twice, and by his first wife had Hannah, Mary, Margaret, Elizabeth, and William M. By his second wife he had Anna and Martha.
Source: A History of the Pioneer Families of Missouri - Warren County