The demographics of Google+ are typically described as predominantly male and young. But that is not always the case; sites that are geared towards women are drawing a Google+ audience that is largely female.
For example, take a look at the +1 Audience Report from the Google Webmaster Tools profile of a major fashion site.
Its Google+ gender breakdown is 80% female, the largest majority I’ve come across to-date:
Gender breakdown of unique users that have +1’d a page on the site.
Women are the strong majority in every age group:
Now for a fashion magazine site with a largely female readership that is hardly surprising. But in the first year of Google+ it has not been all that common to find audience data with women as the majority.
The main reason has been that many sites with a largely female audience have not had enough +1 activity to generate the audience characteristics reports, as seen in this example:
This is still fairly common but it is slowly changing. The fashion site referenced above has less than 10K unique users that have +1’d a page but the numbers are growing and the +1’s are being driven by women.
And even if Google+ is not a strong traffic driver or seemingly natural fit for a particular site, +1 activity has a direct and indirect impact on search engine visibility. So for any type of site it is worth experimenting with Google+ promotion and engagement (see 8 Social Media Questions Publishers Should Be Asking Themselves).
Here are a few more examples. I am not able to reveal the exact sites due to client confidentially but they are all well-known, established brands.