I recently went to a customer with a PC which was full of spyware. The client insisted that she had only had a the PC a year or two. As it was an XP machine I thought it was likely to be older than that.
This got me thinking to how I could tell how old a PC was. If you are sure that windows has not been reinstalled on your pc there is a very easy command you can run “systeminfo”
This will show you the original windows install date as below:-
In the case of my client she was surprised to see that her PC was at least 5 years old.
If windows has been reinstalled the other option is to look at the “Bios” date when the PC Boots up. This will give some indication of when the motherboard was produced.