It depends on what I'm using it for, although I honestly expect my current computer to still play games on at least high settings at 1080p in 2017-2018. I built it in 2012, it has a 970 in it now, along with 8GB of RAM and an i5 3470. I may need to think about upgrading the RAM and I'm probably going to wind up buying a new HDD for it, but I probably won't have much of an issue if I just leave it alone. Hell, I might still be playing video games on it in 2020 if things keep plateauing, though I'd really like to have a new machine by then.
If I stopped gaming on it altogether and never really cared to do anything intensive on it ever again, the parts would stop working before operating systems/programs/applications started asking for more power than it has. Probably.
The more intensive stuff you plan on doing with it, the sooner you'll have to start replacing parts to keep up with modern technology.
On a different note, my parents bought their first computer in 2001 and handed it down to me in 2008. It continued to work, without any upgrades or replacements, until I took it apart sometime in 2011 or 2012. It had an 80GB HDD, a 1.8GHz Intel processor (I think), and 512MB RAM, which was downright pitiful long before it ever stopped chugging along. I installed Ubuntu 9.10 on it and used that as my main operating system a little while after I got it and that helped breathe a little bit more life into it. I still have the keyboard that came with that computer, actually, and it still works, though I don't use it.
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