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.
If a worker begins receiving benefits before his/her normal (or full) retirement age, the worker will receive a reduced benefit. A worker can choose to retire as early as age 62, but doing so may result in a reduction of as much as 30 percent.Starting to receive benefits after normal retirement age may result in larger benefits. With delayed retirement credits, a person can receive his or her largest benefit by retiring at age 70.Early retirement reduces benefits. In the case of early retirement, a benefit is reduced 5/9 of one percent for each month before normal retirement age, up to 36 months.If the number of months exceeds 36, then the benefit is further reduced 5/12 of one percent per month. worker can choose to retire as early as age 62, but doing so may result in a reduction of as much as 30 percent. Starting to receive benefits after normal retirement age may result in larger benefits.