Final answer:
An 18-year-old patient is more likely to present with a labral tear than a rotator cuff tear.
Step-by-step explanation:
A labral tear is more likely to occur in an 18-year-old patient than a rotator cuff tear. The labrum is a ring of cartilage that surrounds the shoulder socket (glenoid) and helps stabilize the joint. Repetitive use of the upper limb, such as during throwing or racquet sports, can lead to a tear of the labrum. On the other hand, a rotator cuff tear is more commonly associated with aging and degeneration of the tendons in the shoulder.