sentences:  According to the May 2001 census, the population of Blenheim was 4,780 people, compared with a resident population in the province of Ontario of 11,410,050 people.In 2001, 16.7% of the resident population in Blenheim were 65 or over compared with 13.2% in Canada.The median age is 39.0 years compared to 37.6 for all of Canada.