Ahhh, discretionary income. What most Americans wouldn't do to have more of it. It's the amount of money we have left over after paying for life's necessities -- food, clothing, shelter -- that goes toward buying fun stuff, such as iPads, vacations, jewelry or new cars, and more serious things, such as health care and education.
The amount of discretionary income depends on how much you make, of course. Generally, the more you make, the more money you likely have to blow on the latest gadgets and widgets. But age is also a factor.