I guarantee if you follow the links they cite as 'sources', they will just cite other infographics or news articles.

It's not that, they're just not explaining the reasons.

For example, women control a majority of assets in large part because they statistically live longer than men. This makes them a higher percentage of the population in general, but a much higher percentage of the population of retirees with retirement savings. And they do most consumer spending because they're typically the ones who do the shopping for the family, even if on average half or more of the money is from the husband. The numbers are largely accurate.

Though it's not clear how many 80 year old widows are inclined to invest their nest egg in a startup.