As lions hit 13, 14, 15, and 16, they get different age lines/wrinkles. I'm proposing getting those as a decor.
For some lore I, and others I'm sure, have elderly lions in the stories.
I usually just use Scar: Emaciated and Worn Eyes to show old age on younger lions, but it's not the same affect as the actual age lines.

One reason I have to support getting this as a decor is because we already have an item called Argan Oil to erase the age lines, so why not have a decor of them too? I don't see a downside to having a decor of age lines, but if anyone disagrees they can go ahead and say why below. I appreciate all input.