Age Gap Relationships?

I know a 16 very soon to be 17 year old girl and she is talking to a 22 year old guy. They have known each other for several years now and is quite obvious that they like each other. I already know that some will say "they're in different stages of life" however this girl is very mature for only being 16. The guy respects and understands that they can't date until she is 18. The young man also gets along very well with her parents. On another note her parents have a 5 and a half year age gap (started dating at 16 and 21). Just to clarify relationship is strictly a friendly one right now and the boy has said point blank that he won't date her until she is AT LEAST 18. He is very careful about everything and makes sure there is always someone with them so that no one can accuse him of anything. (They are usually hanging out in public anyway)

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