Well, you were. We just don't like to think about the fact that since our life expectancy was skewed so far down because of both infant mortality, and childhood injury or diseases prior to modern medicine extending the average lifespan by reducing mother, infant, and child mortality, and there y increasing our overall lifespan, that we frequently forget that most animals would have similar life expectancy ratios, if not lower, without our assistance.

Most children die in nature. That's why our life expectancy 5000 years ago averaged out to 35, but if you lived to 20, you could easily expect to live into your 70s to 90s in many cases.

Extrapolated out to animals that have no concept of first aid or medicine in general, and you have a hell of a lot of lambs that just kinda died on the shepard, for no reason from their perspective.

Edit: I've no idea what YASC is.