This is officially the first pair of wool socks I've ever worn out, but I'd say that six years is not a bad life for them.
I wore the other pair yesterday, and I think you can guess what happened:
I can think of several reasons why these would wear out where they did. For one thing, the heels of these socks are not reinforced (i.e., the heel flap is just plain stockinette). These may also have been knit at a gauge that wasn't tight enough for durability, and to add to it, Koigu is a two-ply yarn, which isn't the most durable construction for a sock yarn. And, of course, Koigu is 100% merino -- no nylon for durability. They were lovely socks to knit and wear, though, so I'm not sorry that I made them. I don't know for sure if Koigu is superwash, so I may try throwing these in the washer and dryer to see if they'll felt (and then I can use them to make a toy or something).
On the upside, my Vitamin D looks like a real sweater now!
I finished the body border last night and picked up for the neckline before bed. I have about four more rows of garter stitch and a bind off to do on that and then all that's left to do is the sleeves. Think I can finish this by the weekend?