How long do Russian blue cats live?
But what cat fanciers consider blue is coloring that actually appears to be gray. The Russian blue has a lifespan of 15 to 20 years in age. It is not uncommon for them to live on average to 18 years of age. At one time, this breed was also known as a Maltese.

Reference:
Russian Blue Cats Pet HealthZone Nationwide Pet Insurance
Apr 30, 2019