I took my benefits at 70, and I have never regretted it. 
In the final analysis, We need to provide for our futures as long as we live. And taking the benefits at 70 maximizes a guaranteed monthly payment for life which is adjusted for inflation. This is what is needed.
If I take the payment stream at 60, I have less than half of the payment when delayed to 70; and If the money is not used immediately, it must be invested and thus subject to the risk of loss, or rampant inflation.
If I die early, before 70, so what. I no longer need it.
Finally, I suspect that betting that you are going to live longer, while knowing that you made provision to live longer, probably contributes to less stress and better health prospects.