Year-olds

He's on the playground, surrounded by 12-year-olds twice a day, five times a week! How do you expect him to be mature?

Source: tatoeba (717544)

Four Canadian provinces permit 18-year-olds to buy and smoke tobacco products; the remaining provinces, as well as the three territories, have set the minimum age to 19.

Source: tatoeba (8120901)

Don't feel guilty if you don't know what you want to do with your life. The most interesting people I know didn't know at 22 what they wanted to do with their lives. Some of the most interesting 40-year-olds I know still don't.

Source: tatoeba (8306972)

When I look at 18- and 20-year-olds and see what they want to do, I'm optimistic.

Source: tatoeba (8452348)