After you exit the vault, the lore is that the bombs fell 200 years ago. But the world, the people, the culture, etc, suggests that it wasn't THAT long ago. In 200 years the land would be lush and green and the people would have already rebuilt by then. By seeing the land, the people, the buildings, the creatures, etc how long do you think it SHOULD have been? I'm thinking I might even make a mod to fix these issues. Yes, I am pedantic that way.