Ageing

Ageing is the process of becoming <a href="/facts/Old_age/nEpQmo9g">older</a> until <a href="/facts/Death/VJmq29qm">death</a>. The term refers mainly to <a href="/facts/Human/rlcTENsr">humans</a>, many other <a href="/facts/Animal/4b8J33nd">animals</a>, and fungi; whereas for example, bacteria, <a href="/facts/Perennial_plants/MQ3NvAUW">perennial plants</a> and some simple animals are potentially <a href="/facts/Biologically_immortal/vjf7eRPH">biologically immortal</a>. In a broader sense, ageing can refer to single cells within an organism which have <a href="/facts/Cellular_senescence/w6f0gfrB">ceased dividing</a>, or to the <a href="/facts/Population_ageing/s71KXvey">population of a species</a>.
In humans, 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. Of the roughly 150,000 people who die each day across the globe, about two-thirds die from age-related causes. 
Current <a href="/facts/Theory_of_aging/AHmBEpe8">ageing theories</a> are assigned to the damage concept, whereby the accumulation of damage (such as <a href="/facts/DNA_oxidation/3KCAWz3x">DNA oxidation</a>) may cause biological systems to fail, or to the programmed ageing concept, whereby the internal processes (epigenetic maintenance such as <a href="/facts/DNA_methylation/npoRhsnX">DNA methylation</a>) inherently may cause ageing. Programmed ageing should not be confused with programmed cell death (<a href="/facts/Apoptosis/8dVzSm4y">apoptosis</a>).

Ageing open-in-new

Ageing