There is a medical recommendation for ages 9-25 in my country though the public funded mass vaccination program is for 12-13 as the most effective age.

The thought that a 9yo would need protection from STDs is very upsetting which I would guess makes it a talking point. It is better to mass vaccinate at whatever age is publicly acceptable than not at all so I would concede that to critics.

Anyone exposed to sexual activity at such an age is clearly a victim of abuse. Penalising victims of abuse, whether it be forcing them to attempt to carry a baby to term, against medical advice, or forcing them to deal with the consequences of STDs is a very peculiar and nasty attitude. When societies start justifying denial of care and treatment along lines of class, politics, age, race, religion, gender or perceptions of "morality" there's a bigger problem.