In the days of old people would keep computers as long as 5 years or longer. However these days a new computer barely gets past 3 years before needing replacement – or so it seems.
You can easily get 5 years out of a computer if you buy it correctly the first time.
In fact, you most likely already own a computer that you can get a few more years out of.
Please 
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Can also offload/copy onto external hard disk. I’ve got years of program CDs, downloaded programs et. al. sitting on an external drive. It’s often been a lot easier to find them there than to dig through the Original Software box.