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.
One must also be at least 35 years of age to be president. John F. Kennedy was the youngest person to be elected president; he was 43 years old when he was inaugurated in 1961. There is no maximum age limit set forth in the Constitution. Ronald Reagan was the oldest president; at the end of his term in 1988, he was nearly 77.