One of the trickiest aspects of retirement planning is figuring out how much to save. If you're 32 years old, it's hard to know what your expenses will look like 35 years from now, which is when you may be retiring. And as such, it's hard to know how much savings to aim for.

Americans on a whole, however, seem to think that it'll take about $1.5 million in savings to attain a comfortable retirement, according to data from Northwestern Mutual. And while you don't necessarily have to use that number as your personal savings goals, you may decide to do so in the absence of having another benchmark in mind.

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Source Fool.com