I took it when I was sixty-six, my "full retirement age". I looked at how long it was going to take me to break even on cash flow basis if I waited until I was seventy and did not think waiting was worth it.

My decision was tempered by the fact that my dad only lived to be seventy. I am seventy-five now and feel like I am playing with house money.

I might add I worked until I was sixty-nine so the additional money made it easy for me to increase contributions to my 401k etc.

My understanding is that if you think you have made a bad decision down the road if you pay it all back you can still draw it at seventy at the increased rate.