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.
Upon the death, resignation, or removal from office of an incumbent President, the Vice President assumes the office. The President must be at least 35 years of age, has to have lived in the United States for 14 years, and has to be a natural born citizen of the United States.