You use aged followed by a number to say how old someone is.
Alan has two children, aged eleven and nine.
艾伦有两个孩子,岁数为11岁和9岁。
Aged means very old.
She has an aged parent who's capable of being very difficult.
她有个年迈的、很难伺候的父亲。
You can refer to all people who are very old as the aged.
The American Society on Aging provides resource services to those dealing with the aged.
美国老年协会为那些处理老年人问题的人提供资源服务。