Maine Coon weighs 12.5kg (27.5lb)

Kefir is only 22 months, located in Stary Oskol, Russia. 

Maine Coon cats do not reach full physical maturation until they are about 4-5 years old. The accepted size standard for the breed ranges between 11-25lbs, with the males being larger than the females.

This breed grows at double the rate of other domestic cats. They can easily gain 2 pounds per month during their growing cycle.  The standards are 15-25lbs for males and 11-20 pounds for females.

https://en.wikipedia.org/wiki/Maine_Coon

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Photo Credit: SWNS South West News Service