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.
Ulysses S. Grant was among the youngest U.S. presidents in history. Ulysses S. Grant is the fourth-youngest president in U.S. history. He was 46 years, 10 months and five days old when he took the oath of office in 1869. Until Roosevelt's ascension to the presidency, Grant had been the youngest president to hold the office.