I was 13 and I can look back and see why I did it but I tell you that from the get go I knew how to protect myself and how to avoid diseases and pregnancy, so at least I was making an informed decision.
Do I feel hypocritical telling others not to do that.........
No, because I know how much of a mistake it was even if I was fully informed. So, when I advise against it I speak from experience not high mindedness.