how old was sean lennon when john lennon died

Sean Lennon was 5 years old when his father, John Lennon, died.
Born on October 9, 1975—coinciding with John's 35th birthday—Sean had just turned 5 a few months before the tragic events of December 8, 1980.

Key Timeline

• Birth : October 9, 1975, in New York City to John Lennon and Yoko Ono.

• John's Murder : December 8, 1980, outside the Dakota apartment building; Sean was at home, shielded from initial news by his mother.

• Age Calculation : From October 1975 to December 1980 spans roughly 5 years and 2 months, confirming he was 5.

Family Context

John had stepped back from music to focus on fatherhood after Sean's arrival, creating cherished early memories cut short by the loss. Yoko Ono ensured Sean, then a young child, learned of the death privately amid global shock. This moment reshaped the Lennon-Ono family, with Sean later honoring his father's legacy through music.

Cultural Reflections

Online discussions, like Reddit threads, often note poignant milestones—such as Sean surpassing his father's age at death or reflecting on his youth during the tragedy. These highlight the enduring fascination with the Lennon story 45 years on.

TL;DR: Sean was 5. Information gathered from public forums or data available on the internet and portrayed here.