1. At what age do children go to school in England (in Northern Ireland)?

According to the text, secondary school in Great Britain is for ages 11 to 16 or 18. In the USA, 'secondary school' covers grades 9-12 (ages 14-17). The text specifies that the category includes a 4-year high school and a combination of a junior high school and a senior high school. However, it does not explicitly state the starting age for primary school in England or Northern Ireland.

Answer: The text does not specify the age at which children start school in England (in Northern Ireland). It mentions secondary school starts from 11 years old.