How Long Do Pigs Live. Their shorter lifespan is due to their exposure to harsh weather famine and predators. The Truth About Mini Pigs Mother Earth News Mini Pigs Mini Pig Pet Juliana Pigs The average lifespan of a pig is 10-12 years but some pigs have been known to live up to 20 years. . Pigs live an average of 5-18 years depending on their domesticated status. Best bedding for guinea pigs. This is much longer than other small mammal pets like hamsters mice and rats but shorter than animals like dogs or cats. Feral pigs on the other hand have an average lifespan of only 1 to 2 years with few living for more than 6 8 years of age for environmental reasons. Guinea pigs last longer as pets. Guinea pigs live for an average of 5-7 years but some have lived much longer. If a pig is intended as food animal it is raised from 6 to 7 months to reach the market weight of 250 pounds. When taken good care of as pets