I did not say a computer only lasts three years, I said after three years (on average) they BEGIN hitting obsolescence issues.
It's due to the rate at which software and hardware advances.
Use that figure to put your own pc's age into perspective. If it's 5 years old, it's pretty old. If it's 10 it's ancient and you will start to have serious obsolescence issues.
I've got a computer from the late 80's that still runs, but I can't do anything useful with it.
I managed the support department for AT&T Wireless for the entire US for eight years. And EMC's five years before that. I was in charge of tens of thousands of PCs. Trust me when I say three years is where they start falling behind noticeably.
Advanced users notice it first of course, and need to upgrade sooner, but my entire point was - upgrade, or risk hitting problems that require you to start figuring out how to adapt your old machine to the world - that can take more effort than just staying up to date.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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