An intelligence quotient (IQ) is a total score derived from several standardized tests designed to assess human intelligence. The abbreviation IQ was coined by the psychologist William Sterne for the German term Intelligenzquotient, his term for a scoring method for intelligence tests at University of Breslau he advocated in a 1912 book.
Answer: Ronald Reagan became the oldest president when he was elected in 1980 at the age of 69.
At the time, Reagan was the oldest person elected to the office of the presidency (at age 69) and the oldest president at the time of inauguration, at 69 years, 341 days (Donald Trump surpassed this record when he was elected president at age 70 in November 2016).