Seriously not a good reason. Problem is, people who can not accept how IT works, and evolve, should just use pen and paper and be safer for it.
Or they will just suffer the consequences, or the rest of us will, whenever their pc become part of a botnet.
Yes, there are systems that are running equipment, which has to run its life before it can be retired along with whatever version of any operating system it came with.
It is just how it is, and those who are responsible for those systems will just have to sandbox them the best they can.
But honestly any private person, who is not running expensive equipment (no your US robotics 33.6 modem is NOT part of that list), have about zero excuses for running a 13 year old system. Djeez!