"The accumulation of changes responsible for the sequential alterations that accompany advancing age and the associated progressive increases in the chance of disease and death.
The inborn aging process is now the major risk factor for disease and death after around age 28 in the developed countries and limits average life expectancy at birth to approximately 85 years. "
Definition Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC51872/
risk factors
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