Why Invest Now?
It's simple: the sooner you start, the more money you'll have. And the longer you wait, the less you'll have. Here's a startling (and real) example:
How Much You Put In vs. Total Account Worth
Okay, this chart shows the total account worth of your IRA if you start saving at 21.

Now see what happens if you wait until age 35 to start.

These charts assume monthly contributions and an 8% rate of return compounded monthly. Your own plan may earn more or less than this example and income taxes would be due when you withdraw from your plan.