My first problem with you're words is that pedophilia implies being more attracted to the pre-pubescent than the post-pubescent. 13 is during puberty, not pre=pubescent. My issue is it puts a 13 year old in the same category as a 3 year old, which I find insulting as a human being, and as someone who was just as much a human being at 13 as I am now at 20. No changes really, just no more voice cracks and no more acne. So from a mental perspective that was insulting to me, but no worries, I know you didn't mean it, and I don't care.
As for a double standard, it's a trillion times more likely that sex between a 26 year old male a 13 year old female is not consensual than between a 13 year male and a 26 year female. It's not a double standard, it's common sense rooted in reality. It would be just awesome to have sex with an attractive female teacher, but if you were a girl, you probably would want it to be with someone you're age and a more emotional experience and all that jazz. Also, a 13 year old girl's vagina is not fully sized, and it would be very painful for her to have sex with a grown man. It's pretty simple. There's a lot more potential for harm when the larger person is male than if the larger person is female (and potentially and rather likely physically weaker in the latter case)
So I see no double standard.