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.
Any medium or larger company will give everyone a 401k because it is good for the executives and 401k rules require you offer them to everyone not just the high wage earners (there are exceptions to this rule). Plus investment companies make is relatively easy to offer this type of thing to everyone.