Tortoiseshell Cat Lifespan. Certain breeds can live beyond 20 years just like the american shorthair and the siamese. Also called torties for short, tortoiseshell cats combine two colors other than white, either closely mixed or in larger patches.
Therefore, the ways to increase their life expectancy are the same as other cats. With this you have got an idea of tortoiseshell cat lifespan and its behavior too. A male tortoiseshell has an extra x chromosome, making it an xxy.
A tortoiseshell breed of cat doesn't actually exist.
The average length of a cat’s life is around 15 years, but there are a number of factors in play that determine whether she lives to a ripe old age. Because color is related to genes and the x chromosome, 2999 out of every 3000 tortoiseshell cats are female. One of the oldest torties was named marzipan who lived to. If you know that your tortie belongs to a specific breed, such as american shorthair or cornish rex, then look at the lifespan for that cat.