The bubonic plague was a painful disease, with black buboes, or swellings, in the groin and armpits, which lasted up to a week. There was some chance of surviving if the buboes burst.
As of 2015, full retirement age is 67 if you were born after 1960. The amount you receive doesn't change because disability benefits were calculated based on what you would receive at retirement age. However, you may see an increase if Social Security provides a cost of living increase.
The youngest age you can start taking Social Security benefits is 62, but that's considered early. So your check will be reduced based on how many months away from full retirement you are. Full retirement is the age when you qualify for unreduced Social Security benefits. If you were born after 1960, that's age 67. If you delay benefits until age 70, you may be eligible to receive a credit of up to 8 percent per year, depending on your birth year.