Widow's Benefits

Would My Aunt Still Be Able To Switch From Receiving Her Benefits To Receiving Her Deceased Husband's Benefits?

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My aunt retired after her husband did, and he was already receiving SS benefits. When she retired she applied for her benefits, which were much lower than her husband's. Even though it has been over twenty years, is she still able to switch from receiving her benefits, and begin to receive her deceased husband's benefits?

Hi,