I have a lot of sympathy for teenager leading their own sex lives with each other. I have a lot less sympathy for adults that bring up the fact that teenager are entitled to a sexuality when the implication is that adults shouldn't be frowned upon for courting teenagers. Even less so for someone who had to retract his previous positions that children of all age...
EDIT: You haven't read the document clearly because it does not rely on the epstein quote and clearly marks what has been retracted
I am pretty confident that when Stallman writes about large age gaps, he wasn't condoning predatory behaviour, but wanted to emphasize the fact that some people can be fully capable of making their own decisions even if they are in their teens. (I would go a little further to add that some people in their twenties or later can be equally vulnerable to predatory behaviour as regular sheltered teens, and it's mostly up to the upbringing they recieved) Maybe I'm too charitable in my interpretation, but "teens being fair game" is not what I understood for sure.
But I notice that he hasn't written at length about how teenagers should be able to vote before they are 18 that I know of. The fact that he is weirdly fixated over this issue reminds us of Gabriel Matzneff and others who were basically men who wanted to be able to have sex with teenagers because they enjoy it and had no issue with having power over their younger partner.
Teenagers are already allowed to have a rich sex life, what they need is more protection from older men not less.
I mean it is enough to read the report and the quotes to understand that that man is a militant and wants better acess to teenagers for sexual purposes. The report also does a good job of explaining what's wrong with it if you care about those issues.