Jonnelle Marte details it:
Men had an average of $139,467 in their individual retirement accounts as of 2012, compared with the average of $81,700 that women had stashed in their IRAs, according to a report released Wednesday by the Employee Benefit Research Institute, a Washington-based research institute that focuses on health, savings and retirement issues.
As the chart [above] shows, women moved money to their IRAs just as often as men did. This was true for IRAs overall, which saw contributions for 10.9 percent of accounts held by women and 10.8 percent of accounts held by men; for Roth IRAs, which require people to contribute with after-tax dollars; and for traditional IRAs, which can include tax-deductible contributions.
Melanie Hicken considers some of the reasons for the disparity:
[F]emale workers make up about two-thirds of all part-time employees. And the majority of those jobs don’t come with employer-sponsored retirement benefits. That makes it harder to save for retirement at all, let alone to accumulate a nest egg large enough to last decades. Proposals to help workers who do not receive workplace retirement benefits, such as Obama’s new myRA plan, are a start but unlikely to make any major improvements.
The Dish 