Money How to get $100,000 or more in your 401(k) by your 30s November 17, 2018Susan Tompor, Detroit Free PressComments Off on How to get $100,000 or more in your 401(k) by your 30s About 68 percent of millennials on Fidelity's 401(k) platform have all of their money in the plan invested in a prepackaged target-date fund.