I know that Google Analytics considers a user who has visited a site in the last 2 years a Returning User. I'm trying to find out whether it would be possible to check what % of users were Returning Users, say, in the last three months? To clarify, a user who visited the site 2.5 months ago would be considered a Returning User, whereas a user whose last visit was 4 months ago would be a New User.
Presumably GA does hold this data as the cookie that recognises a Returning User would have recorded the last time this user visited the site.
Extra context in case anyone is interested, but not essential to the question:
I'd like to know what % of my users return within a reasonable time frame (3 months) so that the assets downloaded by the browser on their last visit hadn't changed; if the assets had changed, the browser would need to request them again which means that the benefit of the initial caching is lost. For instance, if a user last visited my site 2.5 months ago, it's likely that most of the assets hadn't changed so the site loads faster. However, if most of my users last visited over a year ago, it's likely that a big portion of the assets had now changed, and the user's browser needs to request them again.
I'm surprised that GA isn't more flexible about letting the user decide what a Returning User is, but I might just not know how to do it.