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.
He took the office in 1901 at the age of 42. Find the complete list of top 10 oldest United States presidents below: Ronald Reagan: 69 years old; William Henry Harrison:68 years old; James Buchanan: 65 years old; George H.W. Bush: 64 years old; Zachary Taylor: 64 years old; Dwight D. Eisenhower: 62 years old; Andrew Jackson: 61 years old; John Adams: 61 years old