Canada’s largest and most comprehensive study of aging has opened its national headquarters at the McMaster Innovation Park in Hamilton, Ont.The Canadian Longitudinal Study on Aging (CLSA) is a long-term research project examining the factors that shape healthy aging. The national study will follow 50,000 men and women aged 45 to 85 for 20 years. The CLSA collects information on the changing biological, medical, psychological, social, lifestyle and economic aspects of people’s lives as they age.