Aww hell, I almost fell off my chair laughing at hamsmaggoo's can of worms. But as I follow the idea, stonefrog said it best, in that they don't need complex dialog which could be possibly annoying.
Most likely a child confronted with a PC who is either, infamous, famous, a hero of renown, armed, or just plain scary looking is not likely to show too much character. Especially in a harsh fantasy setting where, like stonefrog said, children have their place, and are to respect elders etc.
I completely agree about lamplight... I found it slightly annoying too. I also think that Fallout 3 a bit different again to TES however; IMO Fallout 3 is a more comical depiction of the two (the roaring, smiley 1950's pre-era), this allowed them to get away with more fanciful content.... I don't think TES carries quite the same, and in future TES games I suspect the npc's, and story, even more-so to be of a slightly more realistic tone.
Someone mentioned the slider bars which controlled age in oblivion. I'm no graphics artist, but in speculation, could the same idea not be applied to age/size perhaps? Some script to allow head and limbs to scale accordingly to age... who knows, might even use the same idea to make fat characters possible.?.... anyways,
I think their inclusion could be a mark of a maturing genre in a way. People will always be able to take something out of context and make it into something grim. GTA's had lots of room for that. Whats most important to 'classification/ratings' is that the game doesn't glorify the unsavory behavior.