Is it creepy for a 24 year old male to be with a 18 year old female, and why?

Just curious. A close friend of mine 6 months ago finished getting his doctorate in college and met an 18 year old the day he graduated and they've been together 6 months now happily. Interesting enough a lot of single older women are mad at him now for dating down in age. What do y'all think?
It's okay
It's not okay
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Is it creepy for a 24 year old male to be with a 18 year old female, and why?
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