Well, let's see--in 1935, just before the first SS benefits were paid out, the average American lifespan was 59.9 years for men, 63.9 years for women. IOW, about 2/3 of the people never made it to 65. (Hint: Black life expectancy in 1935 was 51.1 years and 55.2 years for men and women respectively--so it's racist to boot.)
In 2010, the average American lifespan is 76.2 years for men, 81.1 years for women. IOW, if you raised the retirement age commensurate with life expectancy, you could expect to receive SS benefits around age 82-83.
NOW do you see that SS has been, always was, always will be, a friggin scam? And that if you had one functional brain cell in between your ears, you would have realized this and started to save for your own retirement many years ago?