I have a Ship of Theseus desktop built in 2001. Then I replaced some hard drives. Then I replaced the motherboard+CPU+RAM. Then I replaced the video card. Then

I have a Ship of Theseus desktop built in 2001. Then I replaced some hard drives. Then I replaced the motherboard+CPU+RAM. Then I replaced the video card. Then the hard drives...etc, etc. Currently, it's got a 2008 CPU+RAM, a 2010 mobo, drives from 2006-2014, a 2012 GPU, and it's about to get a 2016 PSU, because that just blew yesterday. It's hard to say how old a computer like that is ;-)