Answer: 30
Explanation: The period between 20 and 30 years or even 35 years (when calling premature adulthood) can also have troublesome resources, such as studying in more detail or other psychological and emotional side of this segment. In the twentieth century, everyone agreed that teenagers were not adults. Perhaps in the 21st century you will find that the beginning of adulthood does not really mean the beginning of adulthood.
