My friend (male, 31 years old) is dating an 18 year old girl... Am I right to be a little weirded out by this?

It's their life, but it seems so weird to me. I would never be attracted to someone that much younger and it's kind of making me side eye my friend a little bit.
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My friend (male, 31 years old) is dating an 18 year old girl... Am I right to be a little weirded out by this?
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