What 17 successful people wish they'd known about money in their 20s

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Your 20s are far from simple ... especially when it comes to your finances. Even the some of the wealthiest, most successful people didn't escape this decade without making one (or several) money mistakes.

We asked a handful of self-made millionaires and billionaires, CEOs and entrepreneurs, and best-selling authors what they wish they'd known about money from the get-go.

Here's what they had to say: