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.
1 Through 2006, at age 43, Kennedy was the youngest person ever elected President of the United States, but he was not the youngest ever to serve as President. (Theodore Roosevelt, while Vice-President and at age 42, was elevated to the Presidency following the assassination of President William McKinley in 1901.