Yes.
Marriage in Islam is permissible upon a few conditions.
1: Puberty
2: Mutual consent of the couple
3: Sanity
4: Ability to financially support the bride as the groom pays for the wedding, Haq Mahr (Right of the Wedding is a gift to the bride paid in cash).
Please allow me to disagree here.
1:
Puberty: As I have mentioned, neither in Quran nor in Hadith, there are any guidelines or laws defined.
2:
Mutual consent of the couple: Unfortunately we do not see any example from the time of the Prophet (PBUH) or Muslims after him.
3:
Sanity: No reference in Quran or Hadith, but obviously, its a common sense.
4:
Ability to financially support the bride as the groom pays for the wedding, Haq Mahr (Right of the Wedding is a gift to the bride paid in cash): When Ali married to Fatima, he had nothing to pay her in
Haq Mahr. Prophet (PBUH) asked if he (Ali) owned ANYTHING. He said, I have a body armor (zirrah). Prophet asked him to sell it and bring money to him. That body armor was purchased by Usman for 40 dirham (Usman later returned that body armor to Ali as a gift). Ali handed over all that amount, and prophet purchased household items for Fatima from that money. That could be considered as
Mahr for Fatima.
There are several examples where the Prophet allowed Muslims to marry, and if they had nothing to pay in
Mahr, just teach the bride some ayah of Quran.
As I have mentioned, it is strictly a social and as @
janon mentioned, a moral issue.