Pneumonia is an infection in the air sacs of the lungs. For anyone with a weakened immune system, it can be life-threatening.  This would include very young children, people with compromised immunity, and those older than 65 whose immune systems are in decline. For the elderly, pneumonia is the leading cause of death due to infectious disease. But here’s some great news for those on the far side of middle age.  A 2015 study found supplementing with vitamin E may give you the same resistance to pneumonia enjoyed by youngsters! As we age, our immune systems not only become less responsive, they make more mistakes. This overall decline is called “immunosenescence,” and it occurs in older animals as well as in older humans. The study compared young with old mice infected with the most common cause of pneumonia, the bacteria S. pneumoniae.  In both, immune cells were rushed to the lungs to address the infection. But in the older mice, this response was “overly exube…