College Is Expensive
College is more expensive than ever, leaving graduates living a life of virtual indentured servitude until their 30s or 40s when they might be trying to raise families.
Degrees with no Jobs
There are plenty of degrees being offered that have no actual real job market, some students spend all that money on a degree and don't even have that "high paying" job to go to, because they wasted their time.
Many people are starting to see the value in learning a practical trade and being able to go out in the world and make money sooner and with much less student debt, if any. The world needs electricians, plumbers, and welders, not Gender Studies, Philosophers, and "University Studies" graduates.
Falling Birthrate
Lastly, there is a lot of infertility happening causing the birth rate to drop, as well as people not being able to afford kids (student loans ironically being possibly part of that problem), or have beliefs that they should sterilize themselves.