Pneumonia can affect anyone. But the two age groups at highest risk are:
Children who are 2 years old or younger developing
People who are age 65 or older
Other risk factors include:
Chronic disease. You're more likely to get pneumonia if you have asthma, chronic obstructive pulmonary disease or heart disease.
Weakened or suppressed immune system. People who have HIV/AIDS, who've had an organ transplant, or who receive chemotherapy or long-term steroids are at risk.
Smoking. Smoking damages your body's natural defenses against the bacteria and viruses that cause pneumonia.
Being hospitalized. You're at greater risk of pneumonia if you're in a hospital intensive care unit, especially if you're on a machine that helps you breathe (a ventilator).