The definition of a great RPG
Oblivion is a great RPG hands down. The controls are incredibly easy to use, and even if you step away from the game for a little while, it is still incredibly easy to pick back up and never miss a step. The game is a great mix of quality AND quanity. I have spent almost 130 hours of gameplay doing the side missions and exploring the world, but still have not seen it all, discovered it all or beaten it all. The mainline story quests can be beaten within 20 hours, but the side missions is where the game's strength really lies. Each side mission is totally unique and in doing so, allows for a deeper story to be told. It does have violence against other human and human like characters as well as a whole host of otherworldly baddies, but it is not glorified or the focus of the game. I would recommend at least 16, but you could delve maybe to 14 or 15 if you have a child that is more mature or one that you can have a quality discussion with them. This is the standard that all RPGs should meet.