Not a day over 27 Say hello to Zeb, a Percheron working at The Farmers’ Museum in Cooperstown. He’s 28 in horse years — that’s 80 for us humans — and has been with the Museum since he was three (horse years). he’s more than 16 hands high, each hand equal to four inches, and weighs in at a svelte 1500 pounds. Bob Thompson, Associate Director of Agriculture and Facilities Support Services at the Farmers’ Museum, said Zeb is “pretty…