The available records are contradictory -- perhaps we are dealing with two different women: *On the Botetourt tax list of 1794, John SARVER has three white males 16+ (i.e., two sons b. bef. 1778), suggesting that he was m. bef. 1775, and that his wife was b. bef. 1755. *In the Census of 1820, John's wife is age 45+, or b. bef. 1775. *In the Census of 1830, John's wife is age 70-80, or b. 1750-1760. in Census of 1830, suggesting that she was b. 1750-1760. *On the other hand, evidence suggests that John's eldest son, Samuel SARVER, was b. as early as 1766, and that he had three sons by 1772.
Some researchers (encouraged by the LDS Ancestral File) have inferred from this that John SARVER must have had an earlier first wife, often identified as the Magdelena ZORN who m. 26 Feb 1765 in Germantown, Philadelphia Co. PA to Johannes SORBER.However, available evidence indicates that this couple was still in PA in 1784, whereas John SARVER was already in VA by 1772.
On the other hand, Margaret TROLLINGER's father, "Henry," is known to have been b. 3 Aug 1731, making it unlikely that she was b. bef. 1750.I am unable to resolve these contradictions.