From my knowledge and understanding on the matter - a person is genetically pre-disposed to becoming a paedophile, but will only do so if there is the correct environmental trigger (i.e. he/she was abused, grief, etc). This 'type' of paedophile is the one with very low success rate in terms of people attempting to change his/her behaviour.
There are others who are influenced by only behavioural elelments (and no obvious genetic pre-disposition), and these people have a much greater response rate to therapy.
Some of the research suggests that paedophilia is 'instilled' around the time when people first begin to have sexual thoughts - this is different for different people, but usually pre-teen. If a person later becomes a paedophile, their interest in terms of 'age' is usually around the same age as when they themself had began to have sexual thoughts.
This is very controversial, but in Holland I believe they are questioning whether paedophilia will ever become 'accepted' by society. Their beliefs are that the majority of people who have been given this label do NOT want any sexual contact with children - they just like the company of children, and they also suggest that children may benefit from such a relationship - as it is a genuine 'love'. We only hear of the horrendous stories involving sexual abuse - but the actual number of men and women who have this 'love' for children is VERY high (the attraction of 'youthful beauty'). This will of course depend on how society sees the 'age of consent'. Some other countries see this as low as 12 - to 'us' this is horrifying, but to them, perfectly natural.
I am in no way advocating that I agree or disagree with anything that I write, I just want to bring some research-based fact back into a forum that has gone astray with assumptions