Physical conditions or diseases that can cause knee pain: 1  osteoarthritis: pain, inflammation, and joint destruction caused by degeneration and deterioration of the joint. 2  tendinitis: pain in the front of the knee that is made worse when climbing, taking stairs, or walking up an incline.
Ages Of US Presidents. John F. Kennedy is the youngest-ever elected president, aged 43. However, Theodore Roosevelt is the youngest person to ever become president. He was 42 when he succeeded to the presidency, following the assassination of McKinley. Ronald Reagan is the oldest person ever to be elected president. He was 69.
John F. Kennedy. John F. Kennedy was the 35th President of the United States (1961-1963), the youngest man elected to the office. On November 22, 1963, when he was hardly past his first thousand days in office, JFK was assassinated in Dallas, Texas, becoming also the youngest President to die.