英语“年满”怎么说

我已经年满18岁
I have reached 18 years old.
驾驶汽车要年满18岁
If you want to drive a car,you must be 18 or older.
楼主要找实句来问。不然会很有歧义

be at the age of/...years old
例如,He's at the age of 15. He's 15 years old.

a full year

full year