The term is generally used for humans, animal and plants though there is no bar on it and it is at times also used for the non-living objects as well. It deals with more than one concept including the actual time period of life and the maximum time period of life that is possible in a given species.
Lifespan can vary with improvements in conditions of both living as well as non-living things. Proper care can add years to the life of anything and anyone.
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This is the term that is used to explain the expected age of a person belonging to a certain group of people or to a certain region. It generally takes into account the average ages from a period of time as well as improvement in overall living conditions.
However, there are some flaws in the system. The average age that is taken also includes the infant mortality rate numbers which in case of it being high can actually distort the actual life expectancy.
Currently the highest life expectancy in the world is in Japan which is close to eighty years. Life expectancy greatly depends on the lifestyle and the socio-economic conditions of that area.
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