The RI Cemetery Database gives his dates of birth and death exactly the same as his wife's. Perhaps he is actually buried in Vermont, where he died (?), rather in the Newman Cemetery in East Providence, where Ruth is buried.
John & Ruth had 10 children: Sylvester, Joseph, Molly, Hannah, Betty, Russell, Ruth, Olive, John, & Pruda. John and his second wife Chloe had a daughter Abigail. Information on all of these is included in "The Armington Family in America," but I have given data on only the three who link to other families on this tree.
[S012583] William H. Chaffee, The Chaffee Genealogy, (New York: Grafton Press, 1909), 57.
[S012898] Arthur H. Armington, The Armington Family in America, (Providence: 1928), 5.
[S012899] L. Vernon Briggs, "Genealogies of the Different Families Bearing the Name of Kent in the United States . . .", (Boston: Rockwell & Churchill Press, 1898), 122.