I have 4 older cats one is 19yr old jade, she only has 2 front teeth, Sapphire is the same she is 15yrs you have to keep an eye on Sapphire that she is eating. Same with Amber who is 12yrs as the other cats will try to eat her food. My other 4 cats are all aged from 2 to 4yrs old. One is a rescue from Dubai. Cinnamon has permanent sniffles. They are indoor only and I have 2 ratios linked together. The two litter trays need to be cleaned daily .