Of all generational cohorts, older millennials are most likely to generate enough income to retire comfortably, according to the latest Vanguard Retirement Readiness report.
Specifically, millennials aged 37-41 have the greatest chance of landing a comfortable retirement.
And if you make enough to contribute to both a RothIRA and a 401k, you should do that and not pick one over the other.
Traditional IRAs and Roth 401ks are also things.