The circumstances of the Prophet's marriage to Aisha were very different. Back then, women were indeed looked upon as property, so child marriage was not taboo. Aisha was married to him so that someone with a sharp memory could be around the Prophet at all times and thus be able to memorize all his precious words. But Islam tells us to follow the way of society, which means that now that child marriage is considered taboo, it should be avoided except under certain circumstances, for instance, if a girl's father dies in leaving her in poverty, or during a war, leaving no one to protect her. It has become quite uncommon, which is why such cases are so highlighted. The article says that her death was due to lack of medical care, not due to child marriage. In general, with the need for higher education, the phenomenon of early marriage has shrunk. If after attaining maturity, the girl does not like the person she is married to, she has the full right to annul it. Unlike the West, Islam defines the child as the one below the age of puberty. Once boys and girls reach puberty, they are children no more, and that is when they attain maturity. Thus, a girl of 16 or 17 is considered a full grown female with a free choice and her decision to get married is not considered early.
In Islam premarital relations are not allowed under any circumstances, and they are looked upon as fornication. Illegitimate pregnancies are not acceptable in this religion. Thus, the only way for adults (those who have reached puberty) to satisfy such needs is to get married according to their own personal choice and to have legitimate children
Therefore, teenage sex is recognized in both Islam and the West but the difference is that in Islam it is only allowed to take place within a marriage bond, whereas in the West it is left free. You can see the difference for yourself.