Probably easier to describe as the main first knuckle of the ring finger, along with the equivalent 4th toe joints, both hands and both feet.

They'll just start hurting suddenly and randomly, for seemingly no good reason. Popping those knuckles/joints usually relieves the pain at least.

I figure it's gotta be a genetic defect of sorts, as it affects the same exact joint, left or right, hands or feet, equally, and I recall as early as age 7, perhaps even earlier, having to pop my knuckles to relieve the pains.

Just curious, does anyone else have oddly specific pains like that, where you've basically had those pains all your life but just done got used to them?

That's unusual. I don't have pain, but an unusual thing I do is sneeze repeatedly while or just after I eat breakfast, and this is only at breakfast.