Eighty-year-old Sylvester has begun to complain about his knees. To him, his knees now often feel, "Stiff as a board!" Given this description, Sylvester would appear to have

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The stiffness in Sylvester's knees is a common symptom of osteoarthritis, a condition that commonly affects aging individuals. Turner syndrome and Klinefelter syndrome are genetic disorders that would not typically cause knee stiffness. Osteoporosis is another condition affecting the bones, but it typically presents with bone loss rather than stiffness.

Eighty-Year-Old Sylvester Has Begun to Complain About His Knees