Why Are Younger People More Likely to Experience Side Effects After Vaccine?

More than half of all adult Americans have had at least one dose of a COVID-19 vaccine. The younger you are, experts say, the more likely it is that you will experience a side effect. "It's actually expected to see more side effects the younger you are because our immune system has a more robust response to the vaccines," said Dr. Farshad Fani Marvasti, director of public health, prevention and health promotion at the College of Medicine – Phoenix.