This article here says that there is a link between retiring early and dying early. Is it true that, on average, early retirees will die sooner than their longer working counter parts? Is this a casual link or is the link caused by something else?
Any causal link is more likely to be in the other direction: healthier people may be more willing and able to work longer. The article you point to has the quote
"This difference could not be attributed to the effects of sex, socioeconomic status, or calendar year of the study, although the poorer health status of some early retirees may play some part," note Shan P. Tsai and colleagues at Shell Health Services.