Im 19 and a college student. I pay $135 a month for my 2012 Focus Titanium hatch. I have full coverage (everything as high as it goes) and a $250 deductible. I do not have any tickets though.
If the cars are under your parents name and they are shown as the primary drivers it will be a lot cheaper, and they might not have full coverage or no loans against the cars which both also lower the payment.