premise: Denis Hale Johnson (July 1, 1949 – May 24, 2017) was an American writer best known for his short story collection "Jesus' Son" (1992) and his novel "Tree of Smoke" (2007), which won the National Book Award for Fiction. He also wrote plays, poetry, journalism, and non-fiction.
hypothesis: Denis Hale Johnson lived to be 67 years old.
reason: July 1 1949-to may 24 2017 would be 67 years and 10 months thus he would be considered 67 years old at the time of his death.