"My" William b.1976 (Egloshayle), descends from James Dingle b.1773, (Stoke Climsland) and Elizabeth Mitchell b.1771 (Egloshayle).I suspect (unconfirmed) that "Your" William is a first cousin b.1794 (Egloshayle) to John Dingle and Jane Hart.I have not confirmed the data, but it appears that "your" William had the following siblings: Richard b.1786 (Stoke Climsland), Jane b.1788 (Stoke Climsland), Elizabeth b.1791-d.1791 (Stoke Climsland), and Elizabeth b.1797 (Egloshayle).The parents of both of our Williams were most likely John Dingle b. 1727,8 (?) and Jane Hawton b. 1731 (Stoke Climsland).Jane's parents were Edward Hawton d.1754 and Elizabeth Gerry, d.1775, (all Stoke Climsland)
As for age: James b.1773 (Stoke Climsland) died in 1863 (Croan Ford, Egloshayle (Pencarrow Estate)), age 89.Their son, James, was the oldest man in town when he died at the age of 93 in Hillsboro, IL (USA).The age of 81 for Mary Janein 1871 was not unreasonable: they seemed to have good genes.