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One is consider adult only after 18 years because they are economically productive.They are active in life. They provide sustenance to people of other age groups. They are educated also and this peoole may be helpful for the developing of a country
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Why not 17 years ?
One is considered adult after 18 because one is able to engage in contracts at this time. One is mature at this age to accept all truths of society and know how to live in the society. They know how to deal with problems. And can handle it smoothly. They are able to make correct decisions. They can contribute towards the progress of the country. Due to these one is considered adult after 18.