According to the U.S. Bureau of Labor Statistics, the average American has held 11.7 jobs from age 18 to 48. When switching jobs, 401(k) money doesn't automatically switch with you. In fact, by some estimates, more than 900,000 workers lose track of their 401(k) plans each year! This leaves many people at some point working hard to track down an old 401(k) account or accounts. The good news is that the money should stay in your account. Here are some tips to help you track down your old retirement account.