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Although each individual laptop's actual lifespan varies, on average a laptop will typically give you between three and five years of use. When talking about laptop lifespans, you actually have two different types -- the operational lifespan and the useful lifespan.
So how long is a piece of string - interesting question and this laptop question is exactly the same. A laptop can last any amount of time, and so can a desktop PC. I know you said you've had your previous desktop 5 years but that desktop could have lasted any time too.