Cody Berman (left), Jubilee Bosch (center), and Amber Smith (right) have all followed many principles of the FIRE — financial independence, retire early — movement.Cody Berman/Jubilee Bosch/Amber SmithMany Gen Z Americans are prioritizing financial savviness, aiming for early retirement.Young Americans invest more than previous generations; two-thirds save for retirement early.Four Gen Zers said they're embracing FIRE principles like cutting spending and diversifying income.Gen Z is becoming more financially savvy — and many are doing whatever they can to retire early.Many more young Americans are investing compared to their parents in their early- and mid-20s, and two-thirds of Gen Z has already started saving for retirement, according to the Transamerica Center for Retirement Studies.Four Gen Z Americans told Business Insider they've followed the principles of the FIRE — financial independence, retire early — movement to achieve a high net worth before their 30th birthdays.