You are old Elbert. That is the age at which the vaccinations are most effective, prior to the girls becoming sexually active.
'estimates suggest that universal HPV vaccination of all girls aged 12 years using existing national immunisation or child health programmes could prevent 690,000 cases and 420,000 deaths worldwide over their lifetime'
Here is more information since you are curious. Most breast and cervical cancer deaths occur in developing countries, yet many could be prevented with cost-effective interventions [url=https://www.sciencedaily.com/releases/2016/11/161102080119.htm][/url]