The CLSA will collect information on the changing biological, medical, psychological, social, and economic aspects of people’s lives. These factors will be studied in order to understand how, individually and in combination, they have an impact in both maintaining health and in the development of disease and disability as people age. The CLSA will be one of the most comprehensive studies of its kind undertaken to date, not only in Canada but around the world. Dr. Parminder Raina (McMaster University, Hamilton) is the lead Principal Investigator of the CLSA. Christina Wolfson (McGill University, Montreal) and Susan Kirkland (Dalhousie University, Halifax) are Co-Principal Investigators of the CLSA. Raina, Wolfson and Kirkland, along with a team of more than 160 investigators and collaborators from several Canadian universities have participated in the development of this innovative, interdisciplinary study.