 They tend to not have rotator cuff tears. So we don't really even start to see rotator cuff tears until people are in their 40s and 50s and 60s. And the reason for that is the tendons gradually start to wear out and get thinner and thinner over time. They start to fray. They literally look like fronds of a rope hanging down. And that's called a partial tear. McFarland says many people live with partial tears with no activity compromised. At Johns Hopkins, I'm Elizabeth Tracy.