Back in the dark ages, when I was a teenager, I taught myself to crochet. I went to the library and checked out a book on beginning crochet. I stopped at Ben Franklin 5&10, my town still had one in those days (are those stores still around?), and bought a skein of acrylic yarn and a crochet hook.
I still have that hook. It still works, but the finish is worn off on the head of the hook, the shaft where my fingers grip it and on the side where it rests against my hand. Because the finish is gone, it doesn't move smoothly through the loops and so I think it is time to retire this faithful old friend.