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.
This makes him the youngest president to take office in American history. John F. Kennedy was 43 years, 7 months and 19 days when he took office on January 20, 1961. Bill Clinton was 46 years, 5 months and one day when he took office on January 20, 1993.