The lifespan of mammals is about 1 and a half billion heartbeats.
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The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
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The two oldest cats on record lived to 38 and 34 years old, both were owned by the same owner and lived off a diet of bacon, eggs, broccoli and coffee.
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The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
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The oldest living person smoked cigarettes from the age of 21 to 117.
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