The average lifespan of a cat is 12-15 years, although this can vary depending on their breed. Some breeds, such as the Siamese and the Ragdoll, can live up to 20 years, while other breeds, such as the Bengal and the Oriental Shorthair, tend to have shorter lifespans of 10-12 years. Additionally, cats that are kept indoors tend to live longer than cats that are kept outdoors.