Thanks Keith, I think you're right, which would make 1907 as the correct
year of birth. So Johnny was born a century ago.
"If you're getting 1908 by subtracting 42 from 1950, you've probably
made a mistake. Given that he died so early in 1950, it's almost
certain that he turned 42 in 1949. 1949 - 42 = 1907"