SJSinNYC: They can easily make it if they don’t pay tuition (free tuition is a large point that many kollelim (and rabbaim who want their students to go to kollel, at least in my experience) push, especially OOT (Not to say it is a problem, but a fact)).
The girl can also be a stenographer, which is not college, and can be done part time.
She can get married at 30 after getting a large nest egg, and living off the interest.
There is no reason why it can’t be done, but it is a sacrifice. Ein Totah Nikenes Ela B’Me She’Maimis Atzmo Aleha.