Reply To: He has a past, and she doesnt know. Or the other way around.

After he stops doing whatever it was, the fifteen year old might be tempted, and overcome that temptation. Eventually, he is not even tempted! He may look back and think, “I dont know WHAT possessed me to do that!” As soon as this behavior becomes completely unappealing to him, I’d say he is a different person–because he no longer has even the urge to behave like that.

But. The situation I brought up is not a one time thing, when he is fifteen.

Most people dont hold it against them from the age of 15, but older–around 19, 20 when he/she should have been a LOT more responsible and mature.