People who do regular volunteer work tend to live longer, on average, than people who do not  It has been found that doing good,  a category that certainly includes volunteer work, releases endorphins, the brain's natural opiates, which induce in people a feeling of well-being
Clearly, there is a connection: Regular releases of endorphins must in some way help to extend people's lives
Although extremely high levels of endorphins could be harmful to health, such levels are never reached as a result of the natural release of endorphins.