Saving up for years just so you can make 70 to 90 percent of your old salary annually when you retire sounds like a mind-boggling idea. How can you save that much while you're still living your life before retirement? Fortunately, there's compound interest -- small amounts of money contributed to a retirement savings account like a 401(k) or Roth IRA that can grow by leaps and bounds over the course of a few decades. Still, you have to plant a seed to grow a tree, and when it comes to saving for retirement, it can be difficult to have the discipline necessary to pay now in order to benefit later. This is where a savings mindset comes in.