How to Tell How Old a Computer Is Option 1: Check Date of Windows OS Installation In the following parts, we will outline some effective methods for you so that you can find out how old your computer is. So, you may be wondering about “how old is my computer” no matter you think it is time for an upgrade or you want to check if the PC is within warranty. But this involves if the computer is still under warranty. Then, you consider sending it to the after-sale service center. Or sometimes the computer doesn’t work properly and even crashes suddenly but you don’t know how to deal with it. It could be helpful to keep an eye on how old your computer is since you may consider a PC upgrade. Meanwhile, the new software that you have installed may not be compatible with the old hardware. If your computers are used for high-intensity work like gaming, data calculation or video editing, the power banks, systems or hard drivers may be at risk of wearing out. In the world of technology, a large number of people are having computers or laptops and you may be one of these users. Know Age of Computer/Laptop – Sometimes Necessary What to Do If Your Computer Is Too Old?.