I did report the first one, but no one who I talked to really believed me. (It was something like 7 years ago) As for the second, well, it may not be prosecutable because I have no idea where the guy is now. What do you suggest?
I suggest you report it now!
It doesn't matter if the guy is not in the jurisdiction. If he shows up again when you are much older, there will be an official record of your report, which will stand if you choose to bring a case later.
I have just spent a week covering a sexual abuse trial whereby the perpetrator was acquitted on the grounds of previous reportage of abuse from the victim.
Even if he's not about, report the abuse NOW!