I found that most people I know spend their money according to their paycheck. If you don't save money as soon as your paycheck comes in, it'll be gone by the end of the month. No matter hwo much you make.
However, when you've come to the point of finding someone you love and want to spend the rest of your life with, living the frugal student life isn't going to cut it. You'll want to move to a bigger place, have kids (trust me, they're expensive!), need a bigger car, etcetera. For us, this was a conscious choice. We choose to spend money on our house, our kids, holidays, hobbies. We do save quite a lot, but I think there is a nice middle ground between spending next to nothing and living from paycheck to paycheck.