If the five-year-old's mental age is also five, and the 60-year-old's mental age is 60, then they both have an IQ of 100: 5/5 x 100 = 100 (average IQ - on age level).
Booth was shot dead in a firefight with Union cavalry troops in a barn in the Virginia countryside on 26th April 1865, after having been on the run for 10 days.
From behind the president, Booth fired the fatal shot. Major Henry Rathbone who was attending the play with the Lincolns, tried to apprehend Booth. John Wilkes Booth escaped the clutches of Major Rathbone and jumped to the stage falling awkwardly which resulted in a broken leg.