Casey-Kirschling — generally recognized as the nation's first boomer (born in Philadelphia on Jan. 1, 1946, at 12:00:01 a.m.) — won't bankrupt the Social Security system by taking early retirement at 62. But after her, the deluge: 80 million Americans born from 1946 to 1964 who could qualify for Social Security and Medicare during the next 22 years.