It appears from looking at the two census records for Sylvester Sweet (ae 63 in 1850 in Hancock, MA, and then ae 73 in 1860 in Rensselaer) that they were the same person. Unless I am missing something, the records agree that this Sylvester was born in 1787, not 1777 as Kathy had mentioned in her initial e-mail. I think she simply erred by ten years when calculating his birth year in the subject line.