We're all geeks here, so naturally you will understand perfectly when I say that I can't just run a single platform at home. I have Macs, Windows boxes and a Linux box -- though in truth, that last one is actually just an old Mac Mini that just happens to be running Linux.
But the answer to "longest living" is decidedly Apple, no matter how I evaluate my menagerie of computers. Because if you evaluate it as the longest I've run any single computer in my house: at eleven years and counting, that would be a 2012 iMac that's still running in the basement. It may not be my primary workstation for any particular use anymore and it no longer runs off of its original spinning-rust drive, as that was replaced with an SSD a couple of years back... but it still runs just fine, and one of my kids uses it to play video games (ahem) bootcamped into Windows.
If you evaluate it as the oldest running computer in my house: at thirteen years, that's going to be either a 2010 Mac Mini Server (the one running Linux) or a 2010 Macbook that's sitting on my nightstand, both of which I obtained secondhand at some point. Both work just fine, though the MacBook doesn't have the battery life that it once had. And as with my iMac, both the Mini and the MacBook now run off of SSDs.
If you evaluate it as the longest I've run any given computer as my primary workstation: at a little over six years, it'll be that 2012 iMac again, as I shuffled it into the secondary position in 2019 when I bought yet another iMac. (2019 was actually a really good year for Intel-based iMacs, if you're looking for one on the secondary market... and it even bootcamps Windows 11 like a champ, with only a little bit of extra coaxing needed for that initial installation.)
Which brings us to that last question: I feel like maybe "current" is a bit ambiguous, given that I clearly routinely use more than just one computer. The 2019 iMac is still my primary workstation for a lot of things and probably will be for quite some time, because that magnificent 5K screen is just really hard to beat... but it's obviously not my primary PC for everything. Thus, I'm going to interpret "current" to more aptly refer to the last computer I purchased... which is an Acer Nitro 5 gaming laptop with a 3070 GPU. I purchased it the day before Thanksgiving just this past year and while I believe it will probably last a few years, I'm by no means expecting it to remain my primary gaming PC for its entire lifecycle; I suspect the ever increasing demands of the games my kids and I play will influence a desire to upgrade the 3060 video cards in their home-built gaming PCs and to likewise replace that Acer... because it's a wee bit more difficult to replace just the video card in a laptop.