I am a saver. When I was a young adult, I was not able to save much, because my husband and I earned less, but we estimated our expenses to be well within our income, and any extras like bonuses were put into savings. Our salaries went up as we advanced in our careers, and at around 6 or 7 years into our marriage we succesfully got to the point that we basically could live on one salary and save the other. Well, the other was also used for travel, and any surprise expenses. At around the time we were 13 or 14 years married we paid off all mortgages, and buy everything outright, so monthly expenses are back down to when we first were married, and we save quite a bit again, although our income went down on the last move we made, when I stopped working full time.
I never save for anything specific, I save for savings sake, for the future, for a rainy day, for the feeling of freedom and security.