75 on January 22, 2017. Family Samuel Rettie is Cowan's great-great uncle. References External links 1942 births Living people Alumni of the London School of Economics Canadian senators from Nova Scotia Dalhousie University alumni Schulich School of Law alumni Lawyers in Nova Scotia Liberal Party of Canada senators Members of the United Church of Canada People from Halifax, Nova Scotia 21st-century Canadian politicians Members of the Order of Canada