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.
He died on April 15, 1865. He was assassinated at the Ford Theater in Washington D.C. by John Wilkes Booth. Abe Lincoln was shot on April 14, 1865; he died April 15, 1865.