What span of years does the book namesake take place in?

The novel "The Namesake" by Jhumpa Lahiri takes place over a span of approximately 30 years. The story begins in the early 1960s with Gogol Ganguli's birth in Calcutta and follows his life through his childhood and adolescence in the United States, his college years, and into his adulthood. The novel ends around the late 1980s or early 1990s.