Let's face it when you're in your 20s, you think you know everything. But that's not exactly true. Why? It's because wisdom comes with life experience, not just age. So when you get to be in your 40s, you realize that there are a few things you would have done differently. That's a fact.
A recent Reddit thread asked, "People over 40, what is something you wish you knew when you were 20?" And the answers are both surprising and candid. Check them out.