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 died at the youngest age of any U.S president. The youngest president died in office at the age of 46. The oldest surviving president so far was John Adams, who lived 90 years and eight months, long enough to see his son also become president. Adams beat out Herbert  Hoover, who lived a mere 90 years and two months.