I'm a little late getting around to this, but back on May 6 of this year former Senator Alan Simpson (R-Wyoming) appeared at an Investment Company Institute program, also broadcast on C-SPAN, to discuss the recommendations of the National Debt Commission he co-chaired with Erskine Bowles. During this he made a couple of surprisingly ill-informed assertions about Social Security (along with, to be fair, many accurate ones) despite the fact that Social Security was one of the main subjects considered by the commission in question. These weren't trivial errors about obscure points, they were remarkably major, fundamental mistakes.
The first reflected a surprisingly common misunderstanding about the meaning of the term "life expectancy." Simpson said that the Social Security retirement age was set at 65 because in the late 1930s life expectancy was only 63. Simpson appears to have been talking about life expectancy at birth -- that is, average age of death -- which isn't especially relevant to retirement age. For more of human history, even as recently as the 1930s in the United States, that average was pushed down by the what was then a large number of deaths among babies and children. The great increase in the average age of death comes mainly from the drastic reduction in the rate of infant and childhood mortality owing to better sanitation and especially vaccines.
In contrast, while people who reach adulthood today can look forward to a longer lifespan, it's not drastically greater. Even the 90th Psalm, written 25 or 30 centuries ago, says, "The days of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labour and sorrow; for it is soon cut off, and we fly away." (Psalm 90:10 KJV). We're not talking here about the vast antediluvian lifespans in Genesis; the Psalmist was addressing the adults of his own day who expected to reach 70 or even 80. Many historical records bear this out. The notion that the human lifespan (as opposed to childhood mortality) has vastly changed is to a large extent a myth.
When Social Security benefits first started being paid, 65-year-old men could expect to live, on average, until nearly 78, and a woman until nearly 80, according to Social Security Administration data. By 1990 the remaining life expectancy for women aged 65 had risen by just under five years and for mean by about half that.
There's a more detailed analysis on this page that points out a troubling fact: High-income people at 65 have seen a much greater improvement in their remaining life expectancy than low-income people have.
When the Huffington Post asked Simpson about this and raised similar points, Simpson at first questioned the accuracy and then apparently misunderstood the meaning of "life expectancy."
During the program broadcast on C-SPAN, Simpson even suggested that Social Security was never meant to be a retirement program but rather a sort of welfare system (then why does it pay higher benefits to those with a higher average income?) and a "Ponzi scheme."
That last is a popular but ridiculous notion that reflects a misunderstanding not only of Social Security but of what constitutes Ponzi scheme.
My guess is that Simpson shares the common erroneous idea that what defines a Ponzi scheme is money flowing from later investors to earlier ones. While that often (but in practice not always) happens in Ponzi schemes, the mere fact of money flowing from newer participants to older ones does not a Ponzi scheme make. If it did, then investing in gold -- or in shares of Apple stock -- would be a Ponzi scheme as well, because the only way to get earn an investment return is to sell the asset to another investor at a higher price than when you bought it, which obviously implies money flowing from a later investor to the earlier one. (Update: For a long time Apple paid no dividends and investors profited only from capital gains, that is, selling shares at a higher price to other investors, but Apple does now pay dividends. There are other successful companies that don't, however.)(Updated 2017 July 21 mainly to correct some bad typing.)