If the Taliban is so opposed to pedophilia, why are there so many reported stories of girls as young as 12 being forced to "marry" men more than twice their age?
The Taliban profess to be opposed to the institutionalized child sex abuse we know as Bacha Bazi, and that appeared to be a significant factor in their early rise to power. But you're right, there is no "non-pedophile side" in any meaningful moral sense.
As far as age: did you know the legal age of marriage was 13 in the United States (NH), up until 2019. Thirteen.