A challenge about women and marriage in Islam

[Zen Badger]

I think a system where an adult man can't marry a 9 year old girl would be better than one where an adult man can marry a 9 year old girl. You can try and commence with proving me wrong now.

You need to propose a full system not just a quote
You need to propose a universal rule not just an exception

for example you can say, the max difference between ages is 20 years, ....

In your OP you said you could prove Islam is the best system when it comes to marriage.

So where is your proof?
(I hope it"s better than your lame evidence for god)