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.
The youngest US Presidents in history were Teddy Roosevelt (42 years 10 months), John F. Kennedy (43 years 7 months), and Bill Clinton (46 years 7 months). Obama was the 5th youngest. It seems the electorate has a stricter age requirement than does the law.