[AIC]

For those that were born in 1946 and later there already exist and passed where the full retirement has been extended to 66 3/4 yrs of age and are in increments of age until the age for full retirement is at age 70 yrs. I do not know where the cut offs are on the scale but this was put into effect in the 1980's or early 1990's don't remember exactly.

[DumpsterDiver]

I do not know where the cut offs are on the scale...

Here is the information from the Social Security Administration's website:

Find Your Retirement Age