What should I do if a 20-year-old coworker is dating a 14-year-old?

I work at mcdonald's. This 20 year old man started working with us today. he's very odd. I was talking to my co workers and they know him. They say he's dating a 14 year old girl. Im not 100% certain its true, but my co worker said she told our GM and he still hired him.

What should I do if a 20-year-old coworker is dating a 14-year-old?
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