What is the average lifespan of a Badger?

Could you elaborate on the average lifespan of a Badger? I'm particularly interested in understanding the factors that contribute to their longevity. Do they have any unique adaptations or behaviors that help them survive longer? Are there any environmental factors that could potentially shorten their lifespan? Additionally, how do the lifespans of Badgers compare to other similar-sized mammals? Your insights would be greatly appreciated as I'm conducting research on the subject.