Frailty and Old Age. The aging population has brought with it illnesses and disabilities associated with old age. Consequently, two branches of science have arisen: gerontology
Genes modifying the lenght of life: longevity and premature aging. Aging is one of the most complex biological processes determined by both genetic and environmental factors.
Aging: The biological clock. Aging is the sum of all the changes that take place in an organism,