He was 51 years old at the time of his death.
Napoleon's cause of death was attributed to stomach cancer, which had been diagnosed by his physician, Dr. Francesco Antommarchi, during his exile on Saint Helena. Napoleon had been experiencing health issues for several years prior to his death, including abdominal pain, nausea, and weakness.
In the final weeks of his life, Napoleon's condition deteriorated rapidly, and he became increasingly bedridden and weak. He passed away on May 5, 1821, surrounded by a small group of loyal followers and attendants.
Following his death, Napoleon's body was initially buried on Saint Helena, but his remains were later exhumed and transferred to France in 1840, where they were interred in Les Invalides in Paris, the final resting place of many French military leaders and war heroes.
While Napoleon's cause of death is widely accepted as stomach cancer based on contemporary accounts and medical evidence, some conspiracy theories and alternate theories about the circumstances of his death have persisted over the years. However, there is little credible evidence to support these alternative explanations, and the consensus among historians and medical experts is that Napoleon died of stomach cancer while in exile on Saint Helena.