Here is the only other information that I have on the Younce family.
John Mast,Jr. b.1760 d. Miami Co., 1822 m Susannah Hoover, daughter of Andrew & Margaret Fouts d 1/11/1813. Children: 1. Elizabeth Jones - widow 2. Mary w of Frederick Yount 3. Catherine Friend des.(dead) w of Jesse Friend c-Andrew, John, Rebecca, Daniel and William 4. Hannah w of John Jones
Mary b. 11/7/1779 d 10/8/1859 married Frederick Yount son of George Chilren: 1. Michel b 1/8/1799 m Noah Hoover son of John and Sarah Byrkett Hoover 2. Mahala b 11/6/1802 m Samuel Kelly 3. Enos b 8/9/1805 m Eva Founts 4. Elizabeth b 2/18/1808 m Henry Fouts 5. Millie Younts b 7/8/1810 m Seth Kelly 6. John M b. 4/17/1813 m Mathilda Stephens 7. Jacob b 3/28/1816 m Rebecca Waymire 2) Elizabeth Kyle
A lot of these names are Quaker. Have you tried looking in the Quaker records.