The age slider effects textures, so it can add tattoos, but it's not possible to add beards this way. It's technically possible to add beards as part of a hairstyle, but that would look terrible because the beard wouldn't move with the mouth. Beards that move with the mouth have to be attached to the mouth, and you can't have variety beards this way - they're across the board for a race/six combination if you add them. Which is why beard mods tend to be used in custom races, and why Sheogorath has his own race.