Islam does not give a specific age for marriage, either for the husband or for the wife. Allah, may He be exalted, says (interpretation of the meaning):
“And for such of your women as despair of menstruation, if ye doubt, their period (of waiting) shall be three months, along with those who have it not”
[al-Talaaq 65:4].
Al-Sa‘di (may Allah have mercy on him) said: “along with those who have it [menses] not” means minors, those who have not yet started to menstruate. Adult women who have never menstruated at all are like those who “despair of menstruation” (i.e., have passed menopause); their ‘iddah is three months. End quote.
Tafseer al-Sa‘di, p. 870
The Prophet (blessings and peace of Allah be upon him) married ‘Aa’ishah (may Allah be pleased with her) when she was six years old and the marriage was consummated when she was nine years old. Narrated by al-Bukhaari (4840) and Muslim (1422).
Ibn Qudaamah (may Allah have mercy on him) said in al-Sharh al-Kabeer, 7/386:
With regard to females, the father may give his minor, virgin daughter who has not yet reached the age of nine in marriage, and there is no difference of opinion concerning that, if he gives her in marriage to someone who is compatible. Ibn al-Mundhir said:
All of those scholars from whom we acquired knowledge unanimously agreed that it is permissible for a father to give his minor daughter in marriage if he arranges her to someone who is compatible, and it is permissible for him to do that even if she is reluctant. End quote.
