“Mary Diden, 80, still has the first doll she ever received as a child, and it is dressed in one of Diden’s own baby dresses. She has also kept her first doll house, a gift at the age of 7, she said. These and hundreds of other treasures are stored away in the house she’s lived in since she was 6 months old. It may be time, Diden said, to part with some memories.”