15 Successful Entrepreneurs Share The Most Important Lesson They Learned In Their 20s

Your 20s are a time for figuring out your place in the world.

Mistakes are unavoidable, but the truly successful learn from these setbacks and move on all the wiser.

We asked entrepreneurs, including billionaire "Shark Tank" investor Mark Cuban and the cofounders of popular retailer Warby Parker, to share the most important lesson they learned in their 20s.