Sunnah is anything which the Prophet did, said or approved. He advised young people to marry, therefore it is sunnah. Religion Islam is based on reality and its a practical religion and a complete code of life. It is a known fact that all those who are trying to underestimate the importance of hadith and sunnah are doing so that then they can have afree hand at interpreting Quran as they like to suit their own needs, because the hadith and sunnah is the key when one has to follow a sunnah then these matters of practicalities are not important. Parents should assist them financially, if necessary, and encourage them to complete their education.
Marriage completes half of our faith.
Yes, to preserve chastity, but they should live in a large home with an extended family and receive plenty of support so that they can finish school and advance in life also. Rushing into marriage at a young age often results in an early divorce as well. If they can support themselves why not If husband can support the couple. With a high standard of living nowadays they should only think of marriage once they are financially stable to support a family as I think that it is not fair to deprive a child of living a full life financially and emotionally. If only they're ready, their financial is stable and they are matured enough.