First job out of college I contributed somewhat less than the max amount. Starting the next year, around age 22, I maxed out and have done so every year since. For a DINK couple accustomed to a very modest college lifestyle, it wasn't a sacrifice at all.
I distinctly remember feeling absurdly rich in those days, despite having a fair bit of student loan/credit card debt, no savings (yet), and living in a small apartment. In the present day, with no non-mortgage debt, NW into the 7 figures, salary about 2x higher (adjusted for inflation), living in a relatively nice house...I don't feel rich at all!