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Lifespan development is the study of growth and change throughout the human lifespan. These changes may be multidimensional, occurring across the lifespan and include physical, mental and socioeconomic changes that happen over time.


For people, animals and plants, lifespan refers to the length of life, according to the Oxford Dictionaries. For equipment, machines, appliances and other products, lifespan describes the length of time for which the item is functional.


The six stages of lifespan development are: infancy, childhood, adolescence, early adulthood, middle age and older age. These reflect the biological, cognitive and psychosocial changes that occur during a person's lifetime, from birth through old age.


The lifespan of a fly is generally 15 to 30 days. Flies prefer temperatures between 75 and 80 degree Fahrenheit, so the warmer the environment, the longer the lifespan. The common house fly lives about a month when outdoors.


The average lifespan of a domesticated cat ranges from 12 years to 18 years. Cats aged 20 years and older are not uncommon. The oldest recorded cat was Creme Puff, a female cat who lived to be 38 years and 3 days old, or the equivalent of 168 human years.


The average lifespan of a bat is 20 years. This is a longer lifespan than most rodents of comparable size, which generally survive only one to two years.


The average lifespan of a frog is 6 to 8 years. The exact length of time depends on the species of frog.