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.
Under current law, people are eligible for Social Security Disability Insurance (DI) until they reach the full retirement age, which is currently 66 and is scheduled to increase gradually beginning in 2017 for those born in 1955 until it reaches 67 for workers born in 1960 or later.