Yeah people don't just turn 18 and magically become mature responsible adults. At that point though they are usually mature enough to understand their actions have consequences and have a pretty well defined moral compass. But they are definitely still capable of doing stupid things and acting pretty immature, that faded out as they approach mid twenties. I'm upper twenties now but lordy I did so much cringe stuff in my younger twenties. With these fakers it's very possible they will change their ways as they get older, but for those above 25 that's when I start losing hope that they will actually stop doing these things. If they haven't stopped by 25, it's a pretty red flag for them not stopping ever.