Last week, a very dear friend of our family celebrated her 94th birthday. As is often the case with the very old and the very young, she has a special relationship with my three-year-old niece - they absolutely adore each other.
My sister told my niece that it was this lady's birthday, and that she was very very old.
"How old do you think she is?" my sister asked.
My niece thought for a couple of minutes, and then, in tones of great authority, said, "I think she's four."