Feline cognitive dysfunction syndrome (also known as feline dementia) is an age-related decline in a cat’s cognitive abilities. One study found that by 15 years of age, more than half of cats showed signs of dementia. There are eight signs to look out for that might indicate your cat has dementia. Disorientation: Just like people with dementia, cats may show signs of confusion or wandering behaviour. But the severity of your cat’s dementia must be considered before making any of these changes.