This Rensselaer man is not mine, but I am still trying to separate men with the same name.
It's possible that the James Agard on the 1820 Rensselaer Co., NY census was the James Aggerd there in 1800 with two males under ten and two females under ten. Husband and wife were both age 26-45 in 1800 and 1820.
A cemetery abstract posted at RootsWeb for Old Presbyterian Church Schaghticoke has a Sarah Agard, who died 5 January 1854 age 57y 10m 16d, wife of John Hogle.
Some information on Agards of Dutchess County can be found in volume two of Settlers of the Beekman Patent by Frank J. Doherty.