Interesting thread.
Yes, I knew familiars lived longer, I thought as long as the PC.
I was a tad confused about what the actual question here was... I guess it is do animals in fantasy games live as long as their real life counterparts...regular animals, not familiars.
Another interesting question is, it is a proven fact that animals in captivity tend to live longer than animals in the wild (not as much chance of being eaten in the food chain, humans to feed it a balanced meal, give it medical care etc.) So would that be true in a fantasy world as well?
I guess it depends how closely you want to base your game on the real world for non-magical creatures.
There was a thread a week or so ago where a guy wanted to keep some chickens with him to produce eggs to live off of and there was some discussion as to the husbandry of chickens in captivity that seemed based primarily on real world care of livestock.
Ok...this is getting weird...