It is the duty of the parents to arrange for the marriage of their children when they reach the age. The Prophet sallallahu alayhi wasallam has stressed that it should be taken seriously and with a full sense of responsibility.
Aboo Sa'eed Khudri and Abdullah Ibne Abbaas radhiyallahu anhumaa related that the Apostle of Allah sallallahu alayhi wasallam said: Whoever is blessed by the Lord with children should give their good names and good training and teach their good manners, and arrange for their marriage when they reach the age of puberty. If he (does not pay due heed to it, and) fails to get their married on reaching the age of marriage, (due to negligence), and they take to ways that are forbidden, the father will be held responsible for it.
Bayhaqi
Commentary
:If we take pattern by the good example of the Prophet sallallahu alayhi wasallam and begin to perform marriages as he had performed his own marriage or the marriages of his daughters, the whole thing will be as easy and simple as it is, for a Muslim, to celebrate the Friday prayers. Blessings will then follow of which we have deprived ourselves through thoughtless imitation of Un-Islaamic societies.