Is it possible for a adult and a minor to date if they were already dating?

If you're confused on what I mean let me explain, let's say you and this guy have been dating for a while. You guys started dating when he was 15 and you were 14. He recently had his 18th birthday while you are still 17. Like, do you guys have to break off the relationship until you are 18 or can you guys continue your relationship?
Is it possible for a adult and a minor to date if they were already dating?
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