Final answer:
Cancer of the testes is most commonly seen in young men or boys and is frequently curable if detected early.
Step-by-step explanation:
Cancer of the testes is commonly seen in young men or boys. Testicular cancer is the most common cancer in males between the ages of 20 and 39 years. While prostate cancer is more common overall, especially in older men, it does not typically affect young men to the same extent as testicular cancer does. The most frequent disorders of the testes in younger men are testicular tumors, which form when cells in the testes grow out of control. If found early, testicular cancer can often be cured effectively with surgery.