单项选择题

A woman saw having trouble with her heart, so she went to see a doctor. He was a new doctor, and did not know her. He first asked her some questions, one of which was: "How old are you
 "Well, I don’t remember, doctor, but I’ll try to think." The woman thought for a minute and then said: "Yes, I remember now, doctor. When I’m married, I was 18 years old, and my husband was 30, my husband is 60 now, and that’s twice 30. So I’m twice 18. That’s 36, isn’t"

What’s wrong with the woman（）

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