Okay, I'm an LBYM'er, so I think other Americans don't save enough.
But, Where did these guys the the 150 million number??
They say that there are nearly 100 million Americans between 21 and 64 with full-time, year-round jobs. 51 million particiapate in employer sponsored retirement plans.
There are about 180 million Americans in this age range. So 80 million don't work full time - some have already retired, some are in school, some are stay-at-home parents (full or part time) while the spouse works. Why would we conclude that they won't be ready to retire just because they aren't contributing to 401k plans this year?
Of the 49 million full time workers, some save through IRAs or other pension plans, some just save. Some are just starting work and paying off debts is smarter than retirement savings.
I'd guess that their 150 million is overstated by a factor of 3, based on the data that they present.