Something that interested me when I was a young lad, sitting and, yeh, staring at my maternal great grandmother (she was OLD, I tell ya! *heh*), particularly as she sharpened her pen knife and used it to trim her fingernails VERY short: onychorrhexis. Nah, I didn’t know what to call it as a six-or seven-year-old lad, but that’s one of the things that interested me: the ridges on her fingernails. *huh* Same as on my maternal grandfather’s hands, and. . . mine, now. (I have one sib I have noted who has the same issue: ridged nails that split easily.) So: trimming my fingernails (yeh, and toenails, now) very short has become a thing for me. Recently, however, I’ve had a really handy tool added to the task: a nail trimming device (a small, rechargeable rotary grinding tool) soundly rejected by the dog. Works for me, though.
Oh, med resources list a lot of different causes for the issue, but only three of them seem to apply to me: heredity, aging, and arthritis. *shrugs* If I can live with joint pain, I can live with this, especially since I have naproxen sodium for the one and this neat lil grinding tool for the other.