

Мне скоро будет восемнадцать лет.
I'll be eighteen years old soon.
Вам есть восемнадцать лет?
Are you at least eighteen years old?
В классе восемнадцать учеников.
There are eighteen students in the class.
"восемнадцать" is in the lesson "Numbers" (Level 3), along with 19 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.