osÂ·teÂ·opÂ·aÂ·thy. n. 1. A system of medicine practiced by licensed osteopathic physicians that involves palpation and noninvasive manipulation of the musculoskeletal system in the diagnosis and treatment of physical dysfunction, in conjunction with other medical, surgical, pharmacological, and therapeutic procedures.
Average Age of Presidents. The majority of the presidents were between the ages of 50 and 59 when they were elected into office. The youngest elected president was John F. Kennedy at age 43. The oldest elected president was Ronald Reagan at age 69.
The oldest president to assume office was Ronald Reagan (age 69 years, 349 days), who was also the oldest in office (age 77 years, 349 days), ending at the inauguration of George H. W. Bush. The oldest living president is George H. W. Bush, born June 12, 1924 (aged 7009288306000000000â  91 years, 131 days).he youngest living president is the incumbent, Barack Obama, born August 4, 1961 (aged 7009171084960000000â  54 years, 78 days). The longest-lived president was Gerald Ford, who died at the age of 93 years and 165 days. Ronald Reagan was the second longest-lived, 45 days short of Ford.