There was a Ruth born 01-Mar-1760 to Jedediah and Eunice Allen [Dartmouth VR 1:24].
Rather than a man who would have been nearly 35 at marriage it is much more likely that the Stephen Wilcox who married Ruth Allen 13-Feb-1782 [Dartmouth VR 2:548] was either:
Stephen, son of Jabez and Hannah Wilcox, born 28-Apr-1757 [Dartmouth VR 1:303]
Stephen, son of Daniel and Sylvis Wilcox, born 20-Sep-1757 [Dartmouth VR 1:303]
The three volumes of "Vital Records of Dartmouth Massachusetts to the Year 1850" are in the public domain and available multiple sites online. For a guide to published Massachusetts vital records see:http://plymouthcolony.net/resources/tanbooks.html
Dale H. Cook, Member, NEHGS and MA Society of Mayflower Descendants;
Plymouth Co. MA Coordinator for the USGenWeb Project
Administrator of http://plymouthcolony.net