Pneumonia vaccine lasts for the whole life. But this might not be if you have a lessened resistance in your body. Depending on your age and immunity, your doctor might ask you to take the vaccine once in 5 or more years

Pneumonia vaccine is given only once in life for all healthy people. For immuno compromised individuals, the medical practitioner might offer the same once in 5 or more years. If you are at 65 and if it had been more than 5 years since you got the vaccine last, you might be asked to take another shot