The Old Age Security pension
You may qualify for an Old Age Security pension if you:
have reached age 65; and
have resided in Canada for at least one year since reaching age 18 and from 1 January 1952; and
were a Canadian citizen or legal resident of Canada at the time of your departure; and
have resided in Canada since reaching age 18 and from 1 January 1952 or have periods of insurance to the National Pension System and/or the Japanese pension systems for employees since reaching age 18 and from 1 January 1952 for a total of at least 20 years.