I have 2 buff Orpingtons that are now 7 weeks old......and I'm thinking they are both Roos but I'm far from an expert on the matter. Since I don't have anymore buff orps to compare them with it makes it harder for me to form my uneducated guess. Any ideas based on the pic?

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Still a bit too young to tell. I can see them going either way.

At what age would it be more conclusive? Other than waiting for them to crow, I'm not real sure what I should be looking for other than red combs and more agressive behavior. One of them is definitely more aggressive than the other.....but they both look identical. Same size legs, same size body, same size and color combs.

THey are also in a brooder with what I am sure is at least 2 other Roos. Barred rocks are much easier to tell and I definitely have at least 2 barred rock cockerels.  It sure if that would change their behavior.

On younger birds I've had pretty good success sexing them my picking them up by their head.  Hens just let you, roosters fight it.  But never tried it on one more than about a week old so not sure if it would work.

watch for that tail feather to start growing

I need to can some chicken stock......after the dumplings are made of course!  

It's not really a big deal either way to me if they are Roos or not. I'm just trying to learn as I go along and this place never ceases to amaze me at the amount of info in our ranks. I know backyard chickens has more info on the subject, but I guarantee someone from this site knows as much about it than anyone from there. That's why I always ask here.

You should have a real good idea if they are roos at about 12 weeks. 

Of course, if they start laying eggs its a dead giveaway