I knew my daughter's age but not mine

Recently, I was talking on the phone with my twenty-nine-year-old daughter about my confusion last month when I was unclear about how old I was. She asked me, “Mom, do you remember how old I am?” Then I told her how old she was and I was correct. She said that she remembered that once I told her that I was twenty-five years older than her. I sure wish that I could remember that one.