I've worked here all of my 'adult life'. [=I've worked here since I became an adult]
People who are close friends as children aren't always friends as 'adults'.
The university offers a popular program of 'adult education'.
(..) Honestly, Fuck it, he leads us out in the canyons, we get bored, we just use him for target practice. - It's too adult for Jacob. We didn't mean to bother you. No bother at all. It's a beautiful spot. I always found it a shame that I have it all to myself. They come here every day. (..)2016 TvShow: Westworld Title: The Original Season: 1 Episode 1