Prevealence of dddz. 30%of a symptomatic people have at least one degenerative discl5 s1 the mostcommon in men l45 most common in women. Proving not all degenerative disc cause symptoms disc herniation events occur much less frquently 2% a year.
Depends on several . Things like the genetic or family history, where the discs are located, if the person smokes &/or is obese and whether the person regularly exercises in addition to a history of any prior back injuries or surgeries. Disc aging has been demonstrated as early as 10 years of age and discs can herniate although rarer, in children.