How do you get a girl to see you are not too old to date her?

Hot girl is a regular at a cafe you work at. You ask her out. She rejects you because she thinks you are "too old" for her, which is not true. You know she is legal, so you are to too old to date her. How would you help her change her mind and start dating you?

How do you get a girl to see you are not too old to date her?
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