Question

what is the difference between life span and life expentancy

Answer 1

Life span is the maximum time a person can live, whereas life expectancy is the average time a person will live, based on factors like gender and birth year. Because life expectancy is an average, it can be lowered due to infant mortality.

Answer 2

Life expectancy refers to the number of years a person can expect to live. It is based on an estimate of the average age that members of a particular population will be when they die. For example, life expectancy of Indian population is about 68 years while that of Japanese population is about 84 years.

Note: Life expectancy of a population mainly depends upon the lifestyle and healthcare facilities. It also depends on genetic constitution of the population.

Life expectancy of a population may vary time to time. For example, life expectancy in India rose to 68 years in 2016 from 32 years at the time of independence in 1947.

Lifespan is the period from birth from natural death of an organism. For example, lifespan of crow is about 15 years whereas that of parrot is 140 years.

Important: Life expectancy is the characteristic feature of a population whereas lifespan is the characteristic feature of a species.