![]() Human beings and members of other species, especially animals, age and die. ![]() Immortal Hydra, a relative of the jellyfish In primates (including humans), such life-extending effects remain uncertain. Obesity has been proposed to accelerate ageing, whereas dietary calorie restriction in non-primate animals slows ageing while maintaining good health and body functions. Programmed ageing should not be confused with programmed cell death ( apoptosis). Of the roughly 150,000 people who die each day across the globe, about two-thirds die from age-related causes.Ĭurrent ageing theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail, or to the programmed ageing concept, whereby the internal processes (epigenetic maintenance such as DNA methylation) inherently may cause ageing. Ageing increases the risk of human diseases such as cancer, Alzheimer's disease, diabetes, cardiovascular disease, stroke and many more. Reaction time, for example, may slow with age, while memories and general knowledge typically increase. In humans, ageing represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes. In a broader sense, ageing can refer to single cells within an organism which have ceased dividing, or to the population of a species. 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. Ageing or aging is the process of becoming older.
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