<unk>  is any change in an organism over time.<unk>  refers to a multidimensional process of physical, psychological, and social change.  Some dimensions of<unk>  grow and expand over time, while others decline. Reaction time, for example, may slow with age, while knowledge of world events and wisdom may expand.  Research shows that even late in life potential exists for physical, mental, and social growth and development.<unk>  is an important part of all human societies reflecting the biological changes that occur, but also reflecting cultural and societal conventions. Age is usually measured in full years — and months for young children. A person's birthday is often an important event.
The term "aging" is somewhat ambiguous. Distinctions may be made between "universal<unk> " (age changes that all people share) and "probabilistic<unk> " (age changes that may happen to some, but not all people as they grow older, such as the onset of Type Two diabetes). Chronological<unk> , referring to how old a person is, is arguably the most straightforward definition of<unk>  and may be distinguished from "social<unk> " (society's expectations of how people should act as they grow older) and "biological<unk> " (an organism's physical state as it ages). There is also a distinction between "proximal<unk> " (age-based effects that come about because of factors in the recent past) and "distal<unk> " (age-based differences that can be traced back to a cause early in person's life, such as childhood poliomyelitis).
Differences are sometimes made between populations of children;divisions are sometimes made between the young old (65-74), the middle old (75-84) and the oldest old (those aged 85 and above). However, problematic in this is that chronological age does not correlate perfectly with functional age, i.e. two people may be of the same age, but differ in their mental and physical capacities.
Population<unk>  is the increase in the number and proportion of older people in society. Population<unk>  has three possible causes:  migration, longer life expectancy (decreased death rate), and decreased birth rate.<unk>  has a significant impact on society. Young people tend to commit most crimes, they are more likely to push for political and social change, to develop and adopt new technologies, and to need education. Older people have different requirements from society and government as opposed to young people, and frequently differing values as well. Older people are also far more likely to vote, and in many countries the young are forbidden from voting. Thus, the aged have comparatively more political influence.
Ageing
Microvascular disease
Prediabetes
Sedentary lifestyle
Alcoholism
Glomerular disease
Diabetes mellitus
Dyslipidemia