I had a great aunt (died before I was born) who believed her birthday was two months later than it actually was. The date that everyone believed to be her birth

I had a great aunt (died before I was born) who believed her birthday was two months later than it actually was. The date that everyone believed to be her birthday was exactly 9 months after her parents wedding (her real birthday only seven months after). I had another great aunt (who I did know) whose drivers license said she was ten years younger than she actually was. They just took you at your word without verifying when she got it.