Background Paragraph: Hepatitis B is a contagious virus that affects the liver, infection can last from a few weeks to a serious lifelong illness. Two different types of infection exist for this disease, "acute" and "chronic." Acute Hepatitis B is a short term illness that occurs within 6 months of exposure, Chronic Hepatitis B is long term and happens when the virus remains in the body. The younger the child is, the greater their chance of developing a chronic infection and this risk goes down as the child gets older. Approximately 90% of infected infants will develop a chronic infection.[3]. 
Story: A 1st grade classroom photo was held today. They all gathered by age. Prince was the youngest. Shirley was the 2nd youngest. Tad was the 3rd youngest. Trinidad was the 4th youngest. Donn was the 5th youngest. Jarred was the 6th youngest. The last one was Tanner, who was the oldest. They all looked fantastic. 
Question: Who has a greater chance of developing a chronic infection: Donn or Shirley?
Shirley.