Haha, the real-life blockchain animal :)
Unfortunately I have no idea what their average life expectancy is. It does not seem like there has been any studies about this in the wild, and those in the lab tend to die from experiments and dissections, so that does not really tell us anything. But it would be very interesting to know. They are sexually mature at a very young age (6 months), which is typical for small animals that tend to live short lives, so I don't really think they live that long on average.