Why a human becomes old ?

Ageing is the process of becoming older. Ageing is among the greatest known risk factors for most human diseases of the roughly 150,000 people who die each day across the globe, about two-thirds die from age-related causes.

The causes of ageing are uncertain; current theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail, or to the programmed ageing concept, whereby internal processes

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