Is it ok for a 15 year old to date an 18 year old?

One of my close friends is 15 and she has been dating a guy for four months who’s 18. They are CRAZY for each other and even though at first I was skeptical about their age gap and whether he wanted her for sex, but the way he looks at her is how I look when I look at dark chocolate (true love in its finest.) They get some judgement from others, but I will support my friend as long as they are happy together and safe. What are your personal opinions about this age gap?

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