Detailed Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Q: Context: Following schooling at Norwich School he was entered at Corpus Christi, Cambridge at age thirteen Link Information: The school is divided into the Lower School, a preparatory feeder school which has around 250 pupils from ages 4 to 11, and the Senior School which has around 850 pupils aged from 12 to 18. Question: What grades attend the school where William was educated until he was thirteen?
A:
Answer: ages 4 to 11