A woman is having some trouble with her eyes, so she goes to see the doctor. He is a new doctor and doesn't know her, so he asks some questions and one of them is, "How old are you?"The woman says, "I don't know, doctor, but let me think about it." She thinks for a minute and then says, "Yes, I know now, Doctor!When I marry , I am eighteen years old, and my husband is thirty. Now my husband is sixty. And that is twice thirty. So I am twice eighteen. That's thirty-six, isn't it?" The woman can't remember  _  age.
thedoctor's her husband's her her son's