Here's something in common about Gen X and Y millionaires: they're hands-on investors who actively work to grow their savings.

That's according to Fidelity Investments' Sixth Fidelity Millionaire Outlook, which also found that Americans from these generations have the most positive financial outlook in the history of the study and spend a great deal of time managing their assets, averaging 30 trades per month.

The financial outlook of Gen X and Gen Y millionaires is about 58 points more favorable than the baby boomer generation and is the highest level seen since the survey's inception in 2006, according to Fidelity.