In the United States, teens are considered adults when they are eighteen. Although in many cases age does not determine adulthood rather it is determined by the way one may act or the way one is perceived by society.
Hope this helps!
Please tell me if I am incorrect, I enjoy learning from my mistakes!
They were able to grow their own food which was a plus for them since the rainfall helped increase their chances of getting food. Hopefully, this helps you. ^^