1) The yeshivos in E.Y. are not the same as the yeshivos in chutz la’aretz.
2) When a boy gets married, the parnassah clock starts ticking.
3) Whether someone learns better as a bochur or as a yungerman depends on the boy, there’s no all – encompassing rule. My observation is that most metzuyanim are better off single (less responsibility – reichayim al tzaavaro v’yaasok b’Torah?).