I think luck and genetics can play a part in lifespan as well.
My first rabbit ever lived to be just over 15, despite the fact that he was not neutered and lived outside for about half his life. I was very young when my parents got him, so didn't know any better back then.
More recently I had one of my house rabbits die when he was only 2 and another one recently passed at the age of 5. These where rabbits who lived indoors, received regular vet care, a very good diet, etc. Long story short, both of them had medical conditions that caused them to pass young.
Smaller breed rabbits usually live longer than giant breeds. Getting them fixed, especially for females, usually greatly increases lifespan as well.
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