What are the chances of a guy in his very late 20s/early 30s, getting with a girl who's in her late teens/early 20s?

I'm in my late 20s, but my mental age is much younger, and I feel more attracted to girls who are much younger than me.
What are the chances of a guy in his very late 20s/early 30s, getting with a girl who's in her late teens/early 20s?
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