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Product lifetime or product lifespan is the time interval from when a product is sold to when it is discarded. [ 1 ] Product lifetime is slightly different from service life because the latter considers only the effective time the product is used. [ 1 ]
Longevity may refer to especially long-lived members of a population, whereas life expectancy is defined statistically as the average number of years remaining at a given age. For example, a population's life expectancy at birth is the same as the average age at death for all people born in the same year (in the case of cohorts).
Lifespan or life span may refer to: Lifespan, 1976 film starring Klaus Kinski; Lifespan, 1983 Atari 8-bit computer game; Lifespan, 2004 album by Kris Davis; Lifespan ...
By another definition, however, maximum life span corresponds to the age at which the oldest known member of a species or experimental group has died. Calculation of the maximum life span in the latter sense depends upon the initial sample size. [1] Maximum life span contrasts with mean life span (average life span, life expectancy), and longevity.
Thus, it must be decided early in the design of a complex product how long it should last so that each component can be made to those specifications. Due to natural degradation, most products will ultimately break down, no matter what steps are taken. Limited lifespan is only a sign of planned obsolescence if the limit is made artificially short.
An automobile is a highly engineered collection of complex components, each of which has its own lifespan and longevity characteristics. The MTBF (mean time between failures) of some components is expected to be smaller than the life of the car, as the replacement of these is considered part of regular maintenance.
Life table" primarily refers to period life tables, as cohort life tables can only be constructed using data up to the current point, and distant projections for future mortality. Life tables can be constructed using projections of future mortality rates, but more often they are a snapshot of age-specific mortality rates in the recent past, and ...
This is especially true for Healthy life expectancy, the definition of which criteria may change over time, even within a country. For example, Canada is a country with a fairly high overall life expectancy at 81.63 years; however, this number decreases to 75.5 years for Indigenous people in the country. [4]