If you're like 40% of Americans, you're making one extremely common financial mistake... and it could be costing you way more than you think.

Some experts think this one thing could cost most people more that $500,000 over their lifetimes. For some, it could be a million-dollar mistake.

Most people aren't doing it on purpose. Instead, a series of other money mishaps prevent them from doing the single most important thing when it comes to building long-term wealth -- investing early. In this video from our YouTube channel, our team breaks down the huge difference between getting started investing in your 20s, 30s, and 40s, and some of the other most common money mistakes people make.