A product's service life is its period of use in service. Several related terms describe more precisely a product's life, from the point of manufacture, storage, and distribution, and eventual use.
Service life has been defined as "a product's total life in use from the point of sale to the point of discard" and distinguished from replacement life, "the period after which the initial purchaser returns to the shop for a replacement". Determining a product's expected service life as part of business policy involves using tools and calculations from maintainability and reliability analysis. Service life represents a commitment made by the item's manufacturer and is usually specified as a median. It is the time that any manufactured item can be expected to be "serviceable" or supported by its manufacturer.
British Rail Class 483 trains were 83 years old when they were withdrawn in January 2021; they were the oldest passenger trains in Great Britain remaining in regular passenger service at the time.
Product lifetime or product lifespan is the time interval from when a product is sold to when it is discarded.
Prince was built 1863 and operated 1864–1936, 1955–1968, 1980-present, a product life of over 150 years, a service life of around 125 years
