Alexa von Tobel, founder and CEO of LearnVest.com, author of "Financially Fearless":

"Not having a financial plan is a plan — just a really bad one! Given what I see as a general lack of personal-finance education, it can be all too easy to wing it with your money.

"I was lucky enough to learn this lesson while still in my 20s, so I had time to put a financial plan into place for myself — and start LearnVest to help people nationwide do the same!"