I am eighteen years old.
years
英 ['jɜ：z] 美 ['jɜ：z]
n.年（ year的名词复数 ）；年纪；一年的期间；某年级的学生
1、他们指着我说，等我18岁了，我们就成立公司，我来当老板。
They pointed at me, saying that when I was18, we would establish a company together, and I could be the boss.
2、不要把我当学生对待。我都18岁了。
Don't treat me as a student. I am18 years old.
3、当我重返模特业的时候，我已经18岁了，他们还是叫我减肥。
So I went back to modeling when I was18 and they said to lose weight.
扩展资料：
询问别人的年龄用
1、How old are you?
how old 英[hau əuld] 美[haʊ old]
[词典] 几岁；
[例句]How old are you?
你多大岁数了？
2、what's your age?
[例句]What's your age? And since when are you doing this? Sister.
你多大了？你什么时候开始干这个的，大姐？