The lifespan of mammals is about 1 and a half billion heartbeats.
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According to official documents, Luo Meizhen was born in 1885, which would make her 127 years old when she died in 2013 and the oldest person ever to have lived.
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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 recorded elephant lived for 82 years.
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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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