I think you have to weigh up the chances of whether this person may be in a position to re-offend.
also, the police may have other evidence from other parties, and your statement might be the one to tip it over to criminal proceedings.
a friend of mine reported a school teacher, many years after the offence. it went to court with a large bundle of other statements, and the teacher went to prison.
I'm not saying it's right or wrong in your case, but I'm also surprised that your counsellor hasn't looked into the matter further. why don't you call the nspcc (or some similar charity) and get some advice?
best of luck to you.