Good morning Mable,
I'm Doug, and I'm sorry to hear of the confusion. My goal is to provide you with excellent service today.
After 20 years of marriage, and you are single and at least 62 years old, you can choose to claim either an ex-spouse retirement benefit, or your own retirement benefit---whichever is greater. However, your ex-spouse benefit is not based on the number of years you were married. So long as you were married at least 10 years you are eligible for an ex-spouse benefit.
An ex-spouse claim can never pay more than 50% of the full retirement benefit of the ex-spouse, and so often if you have worked much of your life, your own social security retirement benefit will be greater than what an ex-spouse retirement benefit would ever pay to you.
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I wish you and yours the best in 2016,