They're 16 days old
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ThanksFrom what I know, you can tell by light colored chests being well defined for roos, pullets often get shoulder feathers first, and your possible roos seem to have bigger combs already. It's a guess at this stage, but if you take into account all 3 clues you can be close to 100%.
They're adorable!
Am I correct in thinking that you are trying to breed true barnevelders.
Using a legbars is a very bad idea as the crest is dominant as is the egg colour. Also barnevelder males are single laced and the ccl is barred. Barred hens line bred to a single male are more likely to produce a partridge type pattern.
In theory what you are trying is possible but in reality it probably isn't, the male will die before you breed enough generations.