on the topic yes DAI, is more PG13 than its predecessors, so much that if the nudity of some romances are removed, the game Become PG13.
and by mature the OP probably refers to realism in a medival world, the filth, the violence and the poverty. The mediavel era in our world, hardly compares to the World presented in Dai, (even disregarding the magic) now with the world of the witcher ... much more realistic. (already disregarding magic).
I made a post about what is realism in the medieval world. Everyone seems to link every fantasy game with the dark ages, or medieval western europe. There it was dirty, and poor, and violent, but that's a small fraction of history too.
The roman empire had plumbing more advanced then Chicago in 1890. Bath houses. Fresh water. A stable governing system that lasted all the way through the 10th century AD. (The Byzantine empire is the late roman empire. Rome didn't fall when some folk say it did.)
Look at the game a little closer....is it really modeled after the era of the crusades after the fall of the greatest human empire?
The thing about the Dragon age world is. Its vastly rich, and very advanced. This world is in a golden era of development, and appears quite advanced to me. They know of medicines, and herbs. They pride costumes and apparal. They aren't fighting over food or resources, but instead playing very intense games of politics.
This era more closely represents the late roman empire AKA the byzantines more then anything else, and so it wouldn't be a dirty filthy poor place at all, and it'd still be perfectly historically accurate. Not that there isn't dirt filth and poverty, but its the same way in modern society too.