My grandmother was getting that way toward the end of her life. She lived to be 104. More precisely, she thought she lived to 104. She died a week short of her birthday, but she thought it was her birthday. We were told she cried in the morning because her family had forgotten her birthday -- we lived in the area and would have come over. Then she didn't make it to the end of the day. This story has me wondering whether mistaking the date contributed to her death.