.jpg" style="width: 80px,
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; float: left;" />Organisms age in myriad ways — and some might not even bother



Scientists have long passionately debated why cells don’t stay vigorous forever. Research in mice, fruit flies, worms and other lab organisms has turned up many potential causes of aging. Some experts blame aging on the corrosive capability of chemically reactive oxygen molecules or “oxidants” churned out by mitochondria inside cells. DNA damage, including the shortening of chromosome endcaps (called telomeres) is also a prime suspect. Chronic, low-grade inflammation, which tends to get worse the older people get, wreaks so much havoc on tissues that some researchers believe it is aging’s prime cause,
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, referring to aging as “inflammaging.” All these things and more have been proposed to be at the root of aging.
Some researchers,
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, like UCLA’s Steve Horvath, view aging as a biological program written on our DNA. He has seen evidence of a biological clock that marks milestones along life’s path. Some people reach those milestones more quickly than others,
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, making them older biologically than the calendar suggests. Others take a more leisurely stroll, becoming biological youngsters compared with their chronological ages.
Many others,
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, including Richard Miller, a geroscientist at the University of Michigan, deny that aging is programmed. Granted,
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, a biological clock may measure the days of our lives,
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, but it’s not a ticking time bomb set to go off on a particular date. After all, humans aren’t like salmon, which

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