Building a million-dollar retirement fund isn't easy, but with the right strategy, it's an attainable goal for many people. When it comes to maximizing your wealth, it's crucial to avoid simply saving for the future and invest instead.

When you invest for retirement -- whether that's through a 401(k), IRA, or other investment account -- you can earn far more than you would with a simple savings account. This also means you won't need to contribute as much per month to meet your goal.

Time is your most valuable resource when preparing for retirement, so the earlier in life you can begin investing, the easier it will be to reach $1 million or more. If you're starting with $100,000, here are three ways to reach millionaire status depending on how many years you have to invest.

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Source Fool.com