Social security 即使早退休也有限制，最早为62岁， pay will reduce 30%

Workers planning for their retirement should be aware that retirement benefits depend on age at retirement. 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