Forty (adjective)

1. Being ten more than thirty.
2. Representing or approximately equal to the number 40.

Origin:

From middle english fourti, from old english fēowertig, from fēower ("four") + -tig ("-ty"). cognate with german vierzig, dutch veertig.

Examples:

1. She's in her early forties now.
2. It was a long, hard battle that lasted forty days.
3. In some cultures, forty is considered a lucky number.
4. He has been practicing law for over forty years.
5. I've been waiting for forty minutes and still haven't seen the doctor.