Hawk was misinformed no doubt. Yes scholars have not strictly set ages simply because they have no authority to do so.That is the rulers/lawmakers responsibility,according to the time and situation.However if we are to go individually and ask them regarding child marriages they will of course never support an underage immature child being given in marriage to some older man, and Allahu alim. Problem is those who value the opinion of scholars will not want such marriages and those who want such marriages will not bother with scholars!