Most of us have heard of tennis elbow, an irritation of the tendons that connect forearm muscles to the outer bone of the elbow. It can be caused and exacerbated by overuse, and though it can affect players of any age – and non-players who engage in repetitive motions, like plumbers, painters or carpenters – tennis elbow can be most commonly found in older players age 30 and above, according to St. Elizabeth Healthcare’s partners at the Mayo Clinic.