Starting at age 60, individuals can receive amounts under the Canada Pension Plan or CPP. The full pension is available starting at age 65; you can get a surplus if you start after the age of 65 and you get less if you start before. It is based on life expectancy, simply to be fair from an actuarial point of view. This change will, I believe, ensure much greater flexibility with regard to the jobs people work prior to retirement.
On October 6th, 2009. See this statement in context.