Is it okay for a 25 year-old girl to date a 21 year-old guy?

Would it be okay for a 25 year-old girl to date a 21 year-old guy? Even if the life experience difference is evident between them? For example, the girl is taking a Masters degree and the guy hasn't started his studies yet.

Is it okay for a 25 year-old girl to date a 21 year-old guy?
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