I did have a friend who was beat up by about twelve or thirteen kids who were all between ten and eleven years old,

我有个朋友曾被十二三个孩子殴打，都在十岁和十一岁之间。

大城市是否危险？ - SpeakingMax英语口语达人

And for girls, they go to a prep school between the age of 4 and 11.

对于女孩，她们在四岁和十一岁之间去预科学校。

英国的教育 - SpeakingMax英语口语达人