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.
1 Members of Congress can begin drawing their full pension at age 62 if they have completed five years of service, at age 50 with 20 years' service, or at any age with 25 years' service.2  They can collect a reduced pension with 10 years of service at ages 55 to 57, depending on their birth year. 3  The Thrift Savings Plan. Members of Congress can begin drawing their full pension at age 62 if they have completed five years of service, at age 50 with 20 years' service, or at any age with 25 years' service.