In society, there is a belief that a man or a woman should be at least 21 years old to go for marriage legally. I personally agree with the above statement, mainly based on the following reasons. The first reason is that at the age of 21, a person is mentally and physically considered a grown-up adult who is capable of maintaining a family. The second reason is that by that time he or she has already finished his or her basic education and is ready to work to earn a living. The following paragraphs will elaborate on the reasons for my argument in detail.