Well there are two words that come to mind here. Uncommon and abnormal.
Unfortunately, abnormal is frequently associated with pathology of some sort, accurately or not. So it has a critical judgemental feel to it.
This situation is certainly uncommon. But it may be normal for him. I think more info would be needed.
If he were the type of person whose religious beliefs were against pre-marital sex, then this would be normal within his moral framework.
If he didn’t like living alone and his Mother enjoyed having him there, that could explain that part of it.
There are all kinds of factors behind people failing out of school, not the least of which is a combination between immaturity and laziness. There are numerous others.
Both of these can be remedied at any time if the guy gets some renewed motivation.
Of course there’s hope for this guy, but he needs to get off his duff and develop some pride in accomplishing things.
If there are some sorts of mental health issues preventing either working, socializing or studying, that can also me remedied. He would need professional help, but it’s certainly not hopeless.
There really isn’t enough info about this person and his motivations and life history to determine abnormal or not.
Uncommon? Yes.
Abnormal? Not enough info to prove definitively.