There are one set of twins that were born 87 days apart. One baby  was born on June 1, 2012. The next baby was born on August 26,  2012.
Not until you reach retirement age. Typically that's 65, though many pension plans allow you to start collecting early retirement benefits as early as age 55. If you decide to start receiving benefits before you reach full retirement age, the size of your monthly payout will be less than it would have been if you'd waited. Ask the folks who run your plan to create a simple table showing you how your payments will vary depending on when you start.
You can start taking your CPP retirement pension at any age between 60 and 70. (You can start taking it after age 70, but there would be no reason to do that, and you would lose benefits.). If you start taking your pension the month after you turn 65 years of age, you will get 100% of your benefit.If you start taking your pension before that age, it is reduced; after that age, it is increased. For example, in 2015, if you start taking your pension at age 60, it will be reduced by 34.8%.If you start taking it at age 70, it will be increased by 42%.You can start taking it after age 70, but there would be no reason to do that, and you would lose benefits.). If you start taking your pension the month after you turn 65 years of age, you will get 100% of your benefit. If you start taking your pension before that age, it is reduced; after that age, it is increased.