My parents own a pair of cats who are both around 15 years old (the cats, not my parents). Now I've always thought that one cat year is the equivalent of 7 human years which means that if the cats were humans they'd now be 105 years old.
Yet I've known other cats to live a lot longer - one of our neighbours had one that lived to be 21. So....
a) what exactly is 'old' in cat terms?
b) who's got the oldest cat in Sheffield?
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I know someone who has a 24 year old cat. There was a story in the Metro a couple of years ago about the oldest known living cat in the UK who was an incredible 33 years old (having been abandoned as a kitten in a rubbish skip).