I was always told that when you are dead you are restored to your best time of life so Elders on dying should have a metamorphosis into the afterlife by reverting into their Young Adult/Adult stage with a beautiful display of stars or whatever! All their ancestors around to greet them.
The problem is that each culture has a different idea of the afterlife so how could you incorporate that in the Sims as a global game? We've got ordinary ghosts and now ancestral "elementals" in Island Living. Would they mix?
PS: I'd rather be a speck of dust exploring the universe myself!