'Stephen Winchell ([son of] Stephen, ...), Born Windsor, 20 Nov., 1698; m. Mary Rouse, of Nine Partners, Duchess Co., N. Y., about 1744; d. in Duchess County. Mary was b. 1705. ...'
If she was the mother of all Stephen's children, and outlived him and married again, as indicated by this source, then she must have been born later than 1705, since their son John was born 1760.