People sometimes go on about future-proofing their computer….. So, just how long do people keep a using a computer? We cannot predict for sure, but as an indication, I wonder how old is the oldest Mac Mini you currently have in use. I replaced my first Mac Mini, the 2005 original base model, after just over 4 years. With the move to Intel, it was close to obsolete, and replacement was more cost effective than repair. The early 2009 base model I bought then is still going strong. It can run the latest iteration of OS X, and most apps, though I have only upgraded as far as Mountain Lion. I have no plans to replace the 2009 Mini any time soon. I reckon on using it for at least another couple or three years.