Yeah, it appears that it's too young to sex at this point. I've heard it can take years before they reach sexual maturity. You may be able to look for pores before with a loupe.
I've tried to see if I could spot pores in my loupe with my little 14 gram leachie and I couldn't see anything that would make me lean either way yet. I'll probably try again when it gets to about the 50 gram mark.