Lifespan, longevity, and ageing
Maximum longevity: 30 years (captivity) Observations: Chickens are considered a relatively short-lived and fast ageing species (Holmes et al. 2003). The maximum longevity in captivity of these birds, however, has been reported to be 30 years (http://www.demogr.mpg.de/longevityrecords). This is not impossible considering the large number of animals kept in captivity, yet remains unproven. For comparative analyses the use of a more conservative value for maximum longevity, such as 15 or 20 years, is recommended. Domestic chicken reach sexual maturity before six months of age.