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Old age is the range of ages for people nearing and surpassing life expectancy.People who are of old age are also referred to as: old people, elderly, elders, senior citizens, seniors or older adults. [1]
Disability-adjusted life years (DALYs) are a measure of overall disease burden, expressed as the number of years lost due to ill-health, disability, or early death.It was developed in the 1990s as a way of comparing the overall health and life expectancy of different countries.
A new epigenetic mark found in studies of aging cells is the loss of histones.Most evidence shows that loss of histones is linked to cell division. In aging and dividing yeast MNase-seq (Micrococcal Nuclease sequencing) showed a loss of nucleosomes of ~50%.