nclowe76 asked: What's the expected "unlifespan" for a traditional (Romero style) zombie?
Depends if you want them to “alive” or not. In the book I wrote, based as closely as I medically could on the Romero zombies (but still clearly fiction!), the lifespan is longer than it ought to be for someone super-sick, but still finite. After a while, the body needs nutrients to maintain metabolism. My zombies (what a silly phrase!) need to eat like any other living thing, but the virus allows them to ambulate longer than other similarly ill inidividuals. The virus codes for self-parasitosis - i.e., the body eats itself to maintain a longer period to act as vector. (I’m really not a gross guy! I promise!)