Your first three links seem to be irrelevant, I'm not sure why you posted them. The fourth is pretty useful, but notice it assumes that no portion of the Social Security money would go toward a disability insurance. Only a tiny portion would be needed to fund disability insurance, leaving the rest for personal retirement funds. Regardless, it is the last link that I found most interesting. It admits that people born before 1965 can only expect an average return of 2.7%. It doesn't even mention the expected returns of people born later - which falls under 2%. Still, the average, balanced retirement account sees a far greater rate of return. The average mutual fund sees between a 6% and 9% average rate of return. Even the bottom side is more than double what older people can expect from Social Security and more than triple what younger people can expect.