How common are rotator cuff tears?

True rotator cuff tears are thought to be more common with increases in age. Under the age of 70, the prevalence is relatively low, about 30%. From ages 71-80, the incidence increases to approximately 60%, and over 80 years, it jumps to 70%. However, in younger physically active individuals, overuse injuries like tendonitis and impingement are most often the causes of shoulder pain.