In a guest-hosting stint on BBC Radio this week, 31-year-old Oscar-nominated actress Carey Mulligan opened up about her 91-year-old grandmother's battle with dementia since 2004. Mulligan explained, "Every visit for the last seven years, she hasn't recognized any of us. When we leave, she won't remember that we've been there." Mulligan, who was chosen by the Alzheimer's Society to be its first U.K.