The life span of an average cow is about 20-25 years, if it is allowed to live its full life. Generally, cows are bred for milking and/or beef production. Once the cows that are bred for milking purposes have been milked for all the milk they can produce, they are sent to slaughterhouses for beef production. The calves that are not useful for milking are sent to fattening houses and are fed high-bulk cereals, to fatten them and increase the quantity of beef. The calves, thus fattened, are slaughtered at the age of 1-2 years. The life span of cows also depends on the conditions of the farm. On organic farms, the conditions are often much better, in terms of food and low/nil chemical usage. Individual cow owners in developing and underdeveloped countries can have very bad living conditions for cows. Such conditions result in poor health, spread of disease, malnutrition and hence lower age of cows.
Hope this helps.
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