Good morning Ann,
I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today. I have been a licensed attorney for more than 3 decades. Please don't confuse excellent service with a satisfactory outcome based on your wants and desires. I can only explain the law to you---not guarantee that you will be happy with the outcome---any more than a cancer surgeon can guarantee a cure.
In order to be eligible to apply for social security disability, you not only have to be disabled, but as of the date of your application you must be age 66 or greater. Disability is only payable to people who are under full retirement age. So, while perhaps you would have qualified for social security disability at 64----and I say perhaps because if you have had a couple or more of your back surgeries since then you may not have qualified for disability back then----after you reached 66, you were limited to applying for a retirement benefit, or possibly a survivor benefit from social security, depending on your circumstances.
I'm sorry but it is too late for you to consider filing for social security disability at this late date.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
I hope that I have been able to fully answer your question. As I am not an employee of JustAnswer, please be so kind as to rate my service to you. That is the only way I am compensated for assisting you. Thank you in advance.
I wish you and yours the best in 2016,