Nothing is guaranteed, but unless things go off the rail, most people should be better off financially at 30 than right after college. If ds chooses to put down roots in the area his first job is (by college) he’s going to need $60,000 for a down payment for a house. He will be paying down loans, contributing to his 401k, and saving. Having to pay expenses for a child/children won’t help with that. If things do go off the rail, good thing there are no kids in the mix.
His plan is to live in a 3 bedroom apartment with roommates (looks like a dump but only $1700 a month total). He says no kids before 30. When I was young, I also had a mental timeline in mind, like most, finish college, get my MA, get married, have kids, buy a home, retire... It wasn’t etched in stone, of course.