In the line I am tracing, I have a Nathan Nevers, b. 1728, Mass. who is the right age to be married in 1756 but I have no further information on that individual other than that he was the son of Elisha Nevers and Bathsheba Green and had siblings, Phinehas, Samuel, Martha and Jabez. I'm following Phinehas' line; the biggest problem is that there are several Nevers lines, and they use the same names over and over generation after generation. This is the only Nathan that I have who comes close to the date you are looking for, so you might try running down his parents and see if you can find out more about this particular Nathan.