Why do I get turned on by the idea of being with an older woman, but then when I'm not so excited I get sad and want something more substantial?

Sometimes I will waste my time looking for and talking to women that really are too old for me. I know I should be focusing my attention on women within 5 or 6 years of my age...

Why do I get turned on by the idea of being with an older woman, but then when I'm not so excited I get sad and want something more substantial?
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