Men and women aren't equal, so this question has to have two separate answers for each sex. Men should get married after their mid-20s, because they need to first prove themselves in some way. This usually involves demonstrating that they can be breadwinners and provide for their wives and children. In traditional societies, a man would have to pay a dowry before his prospective wife's father would accept the marriage. If we look at the Biblical dowry, it would be equal to about $100,000 in modern terms. The fact that hardly any young man can afford that shows that modern society is screwed, and men will have to delay marriage further (into their 30s or even 40s). However, the good news is that, unlike females, a man can can still sire children when he is older. If he maintains a healthy lifestyle and builds his wealth, he can easily acquire a young concubine or two (if not a wife) when he is older. This is why God allows older men to marry younger women, as we see in the case of many great men in history like King Solomon (pbuh) and the Prophet Muhammad (pbuh). God is loving and just, and does not want to see men suffer from celibacy and lack of sex or children. Men are the most beloved creations of God, which is why when God created Adam, He ordered the Angels to prostrate before Adam. If God is ever harsh on men for deviating from His Law, it is only because God wants the best for us.

As for women, most of them should get married shortly after they become sexually mature, which is traditionally at the onset of their menstruation. I would say at least two-thirds of women should already be married or engaged by the age of 16. If a woman shows exceptional academic ability and high IQ, she should be allowed to pursue higher education, and find a husband who has a similarly high IQ (since you cannot except an exceptionally intelligent woman to be happily married to a mediocre or stupid man). However, I believe that education is wasted on the vast majority of women. What need do most women have for calculus, differential equations, or abstract algebra? Most women would be much happier if they are at home and pregnant with a man that they can respect and rely on.

Afghanistan is the only country that has a future, because it is the only country that recognizes the truth of what I have written. Even the Great Satan could not conquer and subdue Afghanistan, despite spending trillions of dollars to wage war against poor and destitute cavemen. Is this not a sign that God loves those who fight for Him?