I'm only 24, but a few of the joints in my body will 'crack' like a knuckle. My knees and elbows are the ones that I'm really worried about. My knees are able to be 'cracked' about once every 2 to 3 minutes if I extend them, and they can be quite uncomfortable if I do not extend them to the point that they 'crack'. My elbows are similar, but not as frequently 'cracked'. My Jaw is similar in that moving it from left to right will pop it.
I'm wondering if this could be a systemic deficiency of some kind, or just bad genes, or something else entirely?
Any experience with this from anyone else?