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.
Social Security Benefits Age. You can start receiving Social Security benefits at age 62 but, here's the catch: you'll collect less benefits at age 62 than if you wait until the full retirement age that ranges between 66 (for those born between 1943 and 1954) and 67 (for those born 1960 and later).