Answer: 43 years old
Explanation:
In April of 1943, shortly after the book came out, 43-year-old Saint-Exupéry shoved his Little Prince manuscripts and drawings in a brown paper bag, handing it to his friend Silvia Hamilton — “I'd like to give you something splendid,” he told her, “but this is all I have.” — and departed for Algiers as a military pilot
