"Uncle" in Engpsh refers to the brother of one's parent. It is used as a noun.
The age of uncle can be described by adding an adjective before "uncle", such as "young uncle" or "old uncle".
例句：
My uncle is 50 years old. (我的叔叔50岁。)
Can you introduce me to your young uncle? (你能把你年轻的叔叔介绍给我吗？)
I have an old uncle who pves in the countryside. (我有一个住在乡下的老叔叔。)
来源：The word "uncle" comes from the Old Engpsh word "ylfe" which means "father's brother."