This discussion illustrates something I've pondered for some time now -- and it really boils down to just how focused a person is on getting into an NSX (or any other car they dream about).
If you consider a car to be a necessary evil, then you buy a civic and put the rest of your money away to compound. If you consider a car to be a fun distraction to drive on the weekends, you put your money away and let it compound until you can buy the car with cash.
However, at least for me, buying a cool car has never been a rational decision; it ranks just under food and right above shelter on my needs list. I can't imagine being a dyed-in-the wool car guy and waiting until I was sixty so that I could "afford" the object of my desire. I once read about a guy who wanted a Porsche so much that he applied for numerous credit cards, cash advanced them all, then used the proceeds to buy the car. Now that's what I call focus! (Foolish, yes, but focused).
My formula is a simple one; take your income, subtract food expense, buy the car of your dreams, and let the rest take care of itself.
In the meantime, get a good education, get a job that you love and that pays well, and never let intelligence get in the way of a sports car purchase.