40 years? Might as well be talking about another universe.....different times
Didn't tell him to give up....just weigh your options because now is the time for him to concentrate on improving himself. Moving in with a women when you're about to start an academic career is a poor choice in my opinion.
It's cliche but if it was meant to be, it's meant to be
Regardless, he wants his freedom right now so it's all a moot point.....I'd say that's fairly normal for a 20 year old. Age is a HUGE factor in all this. Find out who you are a person before a heavy commitment. Back then, marriage was a case of survival....we're in different times now