The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

How OLD are you, boy?
Game of Thrones Season 2, Episode 7

Yeah. Why wouldn't I want
to get my OLD job back?
The Big Bang Theory Season 7, Episode 17

And if someone wants
to move into my OLD room,
The Big Bang Theory Season 7, Episode 18

An uncommon name here.
An OLD name in Volantis.
Game of Thrones Season 2, Episode 6

is an OLD... amigo of mine.
Westworld Season 2, Episode 4