I fully support the theory that it's been more than 10 years, cause that would be too many big events for one year. Also, to have the Order attract Lady's attention with increased activity and butt in on some of her jobs would take a bit longer time span.I'm guessing that interview has since been voided. It was specifically talking about Lady's age in relation to DMC3 and 4, but in retrospect that would make no sense.
Under that timeline, everyone would have had to transition to their DMC4 appearances from the anime in like a month or something. And I doubt Lady went up three cup sizes that fast.
Another small note about the anime, at the very end it's said that Patty (The girl introduced therein) would keep coming around Devil May Cry to clean it up. In fact, that's pretty much the very last shot of the whole series. By DMC4 though, Dante's place is back to being a complete wreck. That indicates to me that quite a bit of time must have passed, maybe even enough for Patty to grow up and move on with her life.
*cough* Lady was an adult in anime, the only way her boobs would get bigger is through getting fat or getting implants, so not a good example. XD
Dante also lives in a different building and I doubt even him could wreck a fresh purchase that fast.