As far as I’m aware, the Koran doesn’t mention a minimum age for marriage. In Islam, for girls the onset of puberty is the defining criteria – regardless of when that might be. However, since Muslims hold Mohammed, who married a 6 year old, consummating the union when the child was 9, in the greatest esteem, some have no objection to children being married earlier – sometimes as babies – and even if the law of the land defines what we in the west might consider a reasonable minimum age, younger children are still married illegally in Islamic ceremonies.
According to Islam, officially both parties must consent to a marriage, and therefore whilst some arranged marriages might be acceptable to the couple involved, to all intents and purposes forced marriage is not allowed. Nevertheless, it happens, because very often young people are not in a position, or are afraid, to defy their parents, and children, even though they may be asked if they consent, again abide by their parents’ wishes, since they are obviously not old enough to make an informed decision.
As for love or affection, personally I see none of either in any of it - and certainly not from the parents.
I hope that answers your question.