One friend who was asked this question replied that she was as old as the nation of Israel! The daughter of another friend, who was all ears,spoke up.
"Geez,did you cross the Red Sea with Moses?"
"No," the mother of the little girl replied,"She is as old as your Daddy!"
Maybe we need to provide age based on events like being old enough to remember Woodstock and watch the War in the Gulf on satellite, know about the Beatles or the missile crisis in Cuba,Watergate, Vietnam War, Korean Airlift...At least you will know your contemporaries!