On Dad's handwritten family tree, the years 1758 and 1858 are written by his name, and 1858 is circled, but I don't know what that means.
On another sheet, Dad has written in the 1758, and initialed it. It appears that is the correct year, especially when you consider his son's birth year.
From a paper out of the Williams' family Bible-
See note on Meshack Williams regarding dates. ~
Ref; AFN: N7WT-P1
Married Temperance Andrus on July 5, 1781
Their Children:
1. Ephraim Brewsterb. April 9, 1782
2. Asenath Brewster b. Dec. 14, 1783
3.Clarissa Brewster b. Nov 21, 1785, d. 1858
4. Hannah Brewster b. Jan. 28, 1788
5&6. Elisha and William Brewster b. April 5, 1794
7. Anna Brewster b. June 22, 1796
8. Roba Brewster b. Jan. 13, 1799
9. Timothy Brewster b. Oct. 31, 1801
10. Lydia Brewster b. Feb. 22, 1804