Re: FRA for those born in 1957.
FRA is 66 + 6 months.
FRA for 1955 was 66 + 2 months.

Hi. The full retirement age (FRA) for Social Security retirement benefits for people born in 1957 is 66 & 6 months, but the FRA for widow(er) benefits for people born in 1957 is 66 & 2 months. Refer to the following section of Social Security's handbook: https://www.ssa.gov/OP_Home/cfr20/404/404-0409.htm.

Best, Jerry