Your computer might only be two years old, but in terms of tech-age, it is often much older than you realize. The rate at which new technology, malware, and viruses are being produced, it might as well be twenty years old. This is called Moore's law, which states that computers double in complexity every two years. Think of it like the lifespan of a dog or a cat - their lifespan is so short that one human year is equivalent to multiple years for them, meaning that they are much older in terms of their actual lifespan than they are in human years.
USA Computer Services Blog
There are times when you put off something on your to-do list and somehow it magically works itself out. This usually happens when someone else picks up the slack and takes care of what you needed to get done. Then there are things on your to-do list that, if you don't get to in a timely manner, will end up costing you in the long run--like PC maintenances.
Computers are machines that need to be cared for and maintained. If a PC is left totally unattended to and it's used regularly, it will wear down after each use and eventually experience the dreaded crash. The primary piece of equipment responsible for this risk is the hard disk drive. A computer hard drive contains disks called platters that have data written on them. These platters spin at thousands of RPMs and tiny moving parts are used to read the data off of the spinning disks. The intricacy and design of all the tiny moving parts lends itself to product degradation.