Explanation:
The age of Jay Gatsby is not explicitly stated in F. Scott Fitzgerald’s novel The Great Gatsby, but based on details provided in the text, it is likely that he is in his early to mid-30s. Gatsby is described as having “a youthful figure” and possessing a “smile of perpetual reassurance.” Additionally, it is suggested that he served in World War I, which ended in 1918, making him at least in his mid-20s during the war. The novel is set in 1922, which would place Gatsby in his early to mid-30s at that time.