8 year olds are 3rd graders, starting to learn multiplication, division and how to write in cursive. Some are still waiting for primary teeth to come in.
8 year olds are too young to make an informed religious commitment that will affect their entire life. Certainly too young to endure questions regarding their chastity, in fact chastity questions may lead them to knowledge they may have not been familiar with prior to the questions.
Bishops should not be allowed to ask 8 year olds about chastity. Or any other age.