"The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal."
: How the age distribution of a population changes over time and its impact on social and economic life.
Population distribution: The spatial arrangement of a population within a particular geographic area.
Age distribution: The proportionate number of individuals of a specific age group in a population.
Life expectancy: The average number of years a person is expected to live in a given population.
Birth rate: The number of births per 1,000 individuals in a population over a certain period.
Death rate: The number of deaths per 1,000 individuals in a population during a certain period.
Fertility rate: The average number of children born to women of childbearing age (usually 15-49) over their lifetime.
Mortality rate: The number of deaths per 1,000 individuals in a population due to a specific cause, such as disease or injuries.
Age-specific mortality rate: The number of deaths occurring in a specific age group per 1,000 individuals in that age group.
Total fertility rate: The number of children a woman would have if she had each of the average TFRs for each age group of women in a population.
Age-standardized mortality rate: The number of deaths that would be expected in a population if that population had the same age distribution as a standard population.
Dependency ratio: The number of dependent individuals (children and elderly) per working-age individual in a population.
Population pyramid: A graph that shows the age and sex distribution of a population.
Demographic transition model: A model that describes the historical and future changes in population growth rates and structures as countries develop economically.
Ageing population: A population in which the proportion of elderly individuals is increasing relative to the number of children and working-age adults.
Youth bulge: A population in which the proportion of young individuals is higher relative to the number of working-age adults and elderly individuals.
Migration: The movement of individuals from one place to another, often affecting the age structure of populations.
Age-specific migration: The movement of individuals of a specific age group from one place to another.
Aging index: A measure of the proportion of elderly individuals in a population, calculated by dividing the number of individuals aged 65 or over by the number of individuals aged 15-64.
Expansive Age Structure: A population characterized by a high proportion of young people and a low proportion of elderly people. It usually indicates a growing or developing population.
Constrictive Age Structure: A population characterized by a very low proportion of young people and a high proportion of elderly people. It usually indicates an aging population with a low birth rate and death rate.
Stationary Age Structure: A population characterized by a relatively even distribution of people across age groups. It usually indicates a population that has reached a stable equilibrium, with low birth rates and low death rates.
Youthful Age Structure: A population characterized by a very high proportion of young people and a low proportion of elderly people. It usually indicates a population with a high birth rate and low death rate, and is often found in developing countries.
Mature Age Structure: A population characterized by a relatively even distribution of people across age groups, but with a slightly higher proportion of middle-aged adults. It usually indicates a population that has experienced economic growth and social development.
Aging Age Structure: A population characterized by a high proportion of elderly people and a low proportion of young people. It usually indicates a population with a low birth rate and high life expectancy, and is often found in developed countries.
Stagnating Age Structure: A population characterized by a very low proportion of young people and a high proportion of middle-aged and elderly people. It usually indicates a population with a low birth rate, low life expectancy, and limited economic growth.
Shrinking Age Structure: A population characterized by a very low proportion of young people and a very high proportion of elderly people. It usually indicates a population that is declining in size due to a low birth rate and high death rate.
"Ageing increases the risk of human diseases such as cancer, Alzheimer's disease, diabetes, cardiovascular disease, stroke, and many more."
"Ageing represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes."
"Reaction time, for example, may slow with age..."
"While memories and general knowledge typically increase."
"The term refers mainly to humans, many other animals, and fungi..."
"Current ageing theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail..."
"Programmed ageing concept, whereby the internal processes (epigenetic maintenance such as DNA methylation) inherently may cause ageing."
"Programmed ageing should not be confused with programmed cell death (apoptosis)."
"Obesity has been proposed to accelerate ageing..."
"Dietary calorie restriction in non-primate animals slows ageing while maintaining good health and body functions."
"In primates (including humans), such life-extending effects remain uncertain."
"Of the roughly 150,000 people who die each day across the globe, about two-thirds die from age-related causes."
"Ageing can refer to single cells within an organism which have ceased dividing..."
"Ageing increases the risk of human diseases such as cancer, Alzheimer's disease, diabetes, cardiovascular disease, stroke, and many more."
"Current ageing theories are assigned to the damage concept... or to the programmed ageing concept..."
"...whereas, for example, bacteria, perennial plants and some simple animals are potentially biologically immortal."
"Ageing represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes."
"Ageing increases the risk of human diseases such as cancer, Alzheimer's disease, diabetes, cardiovascular disease, stroke, and many more."
"In primates (including humans), such life-extending effects remain uncertain."