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.
Politics of the United States of America. John F. Kennedy. JFK was the youngest elected president to the office at the age of 43 years 236 days. He was also the youngest to leave the office at the age of 46 years, when he was assassinated. Also, Theodore âTeddyâ Roosevelt was the youngest person to become the president at the age of 42 when he assumed the office following the assassination of William McKinley.