Old age is the range of ages for persons nearing and surpassing life expectancy. People of old age are also referred to as: old people, elderly, elders, seniors, senior citizens, or older adults.
Old age is not a definite biological stage: the chronological age denoted as "old age" varies culturally and historically. Some disciplines and domains focus on the aging and the aged, such as the organic processes of aging (senescence), medical studies of the aging process (gerontology), diseases that afflict older adults (geriatrics), technology to support the aging society (gerontechnology), and leisure and sport activities adapted to older people (such as senior sport).
Old people often have limited regenerative abilities and are more susceptible to illness and injury than younger adults. They face social problems related to retirement, loneliness, and ageism.
In 2011, the United Nations proposed a human-rights convention to protect old people.
Definitions of old age include official definitions, sub-group definitions, and four dimensions as follows.
Most developed Western countries set the retirement age around the age of 65; this is also generally considered to mark the transition from middle to old age. Reaching this age is commonly a requirement to become eligible for senior social programs. In non-Western nations, old age can begin as early as the mid-40s or as late as the 70s, although the idea of 'old age' generally shifts around.
Old age cannot be universally defined because it is context-sensitive. The United Nations, for example, considers old age to be 60 years or older. In contrast, a 2001 joint report by the U.S. National Institute on Aging and the World Health Organization [WHO] Regional Office for Africa set the beginning of old age in Sub-Saharan Africa at 50. This lower threshold stems primarily from a different way of thinking about old age in developing nations. Unlike in the developed world, where chronological age determines retirement, societies in developing countries determine old age according to a person's ability to make active contributions to society.
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