Gary Cooper died of prostate cancer, at age 60.
Clark Gable outlived his wife, Carole Lombard, who died in a plane crash. But he died of a heart attack at age 60. Some attributed that to his hard work in the movie "The Misfits' (with Marilyn Monroe). He had lost a lot of weight to prepare for the role, and apparently the filming itself took a lot out of him.
Bogart was a heavy smoker and drinker. He got cancer of the esophagus (throat), wouldn't see a doctor for a long time, and died at age 57.
Cary Grant lived about as long as anyone can reasonably expect. He died at 82, of a stroke.