Under most circumstances, the phrase, "We're from the federal government, and we're here to help" is a punch line. When it comes to retirement savings, however, truer words, as they say, ne'er were spoken.

Life begins at ... 50
That's because, in addition to providing tax-favored savings via IRAs, the Feds have authorized folks of a certain, shall we say, vintage to play catch-up with their retirement savings.

To wit: If you'll be 50 years of age at the end of 2006, you can contribute up to $5,000, while the pre-50 set is allowed just $4,000. 401(k)s can be an important part of your race to the finish, too. You'll need to check the details of your company's plan to ensure that you're eligible, but as far as the U.S. government is concerned, folks who are 50 and older are free to kick in up to $20,000 on a tax-favored basis in 2006.

A pretty good deal, no?

Get smart
A pretty good deal, yes -- provided you take advantage of it to begin with and, of course, that you invest the moola intelligently. With 401(k)s, you'll generally be limited to the lineup of mutual funds that your company provides, but with IRAs, you'll have boatloads of room to maneuver.

With that in mind ...

Choosing investments for that IRA, of course, is tricky business, and you'll want to do so based on your stomach for risk, time horizon, and estimated amount of time you can devote to grooming your portfolio.

If you're of the "buy and forget" persuasion, you may want to consider low-cost index trackers such as Vanguard 500 Index (FUND:VFINX), which, as its name suggests, tracks the S&P 500 and therefore sports exposure aplenty to such market stalwarts as General Electric (NYSE:GE) and ExxonMobil (NYSE:XOM).

But if you're more inclined to go after higher returns and don't know where to start, here's an investment idea: Dodge & Cox International Stock (DODFX). This outstanding mutual fund invests in the likes of News Corp. (NYSE:NWS), GlaxoSmithKline (NYSE:GSK), Vodafone (NYSE:VOD), and Schlumberger (NYSE:SLB), and it runs with an expense ratio of just 0.70%. That price tag, by the way, buys you a management team with more than 17 years of experience under its collective belt -- not to mention a solid track record of market-shellacking performance.

The Foolish bottom line
Irrespective of where you put your retirement cash to work, the important thing is to get going now. And, as outlined above, the good news is that if you're over 50 and perhaps haven't socked away as much as you suspect you should have, the Feds have provided a great way to accelerate your savings.

The Fool, in the meantime, provides a great way to accelerate your learning curve when it comes to all the ins and outs of prepping for retirement. Click here, in fact, and a completely free 30-day guest pass to our Rule Your Retirement newsletter service is yours for the taking.

Your pass provides access to the newsletter's archives, where you can peruse every column inch of retirement advice that's ever appeared in Rule Your Retirement. The service's members-only discussion boards come gratis, too, which means that you'll have a terrific forum for vetting and soliciting feedback on your own retirement ideas and insights.

Another good deal, no? Just click here to get started.

Shannon Zimmerman runs point on the Fool's Champion Funds newsletter service and doesn't own any of the companies mentioned. Dodge & Cox International Stock is a Champion Funds recommendation. GlaxoSmithKline is an Income Investor recommendation. Vodafone is an Inside Value recommendation. The Fool has a strict disclosure policy, which you can peruse by clicking righthere.