The SSA station chief told me that I would be crazy not to sign up at 62. At least get in the system. After that you can suspend payments, change this and that as needed, but at least you are in the system, vested sorta. She also told me that at any time, I can pay back all the money I've received, without interest, and re-baseline my benefits... it's sorta like buying an annuity... when you are 67, for instance, you can pay back all the money you have received, then get a higher monthly benefit. In some cases, a 25% higher benefit for something like $50-70K. Try to find an insurance company that will sell you an immediate COLA annuity of $4-500/mo for $50K. FWIW.