I also still use my DT770s as my daily headphones when I'm at my computer. I wish I had bought the Pro version way back when, as I believe it has detachable cables, and also higher resistance... it's difficult to modulate the volume on my desktop, as even 4-6% can be loud enough in some circumstances and there's not a lot of room for fine control at that level. In any case, I have had mine around the same length of time as you.

However, I also really love my bluetooth headphones, and that's what I use when I'm not at my desk at home. They also work as wired headphones, but I acknowledge they are not affordable to most people. A charge lasts a really long time, and they have some nice features as well. I don't expect them to last 15 years, however.

I bought a specific pair of wired earbuds with a mic to use for conference calls using my phone (Android). Now that my phone is failing and I'm forced to upgrade, I'm a bit concerned that the USB-to-3.5mm dongle for the Pixel 3 may not be compatible w/ the mic in my earbuds. In pictures it looks like it has a proper tip-ring-sleeve configuration so it might work, but at this point I'm just crossing my fingers until I can test.