One of the other claims I hear from vegan/animal rights advocates is that animals in the wild live longer...
And that's easy to believe... until you think about it.
Most animals that die in the wild are killed by predators at a very young age, or succumb to weather or disease before they are mature. Most animals don't live long enough to reach sexual maturity. In any stable population, only enough animals survive to sexual maturity to replace older animals that die.
Nature is brutal to young animals. It isn't unusual for a duck to hatch out a clutch of a dozen or more eggs, and within a week all the baby ducks are gone. Feral horses on open range lose about fifty percent of their foals within the first year.
Under human care the average age of animals going to slaughter is far later than the average for similar species in the wild. And breeding animals live longer as an average too.