Austrolorp Hens or Roos? Please help!

[cassandrod1]

Hi just wondering if anybody could tell by these pics if any of these are hens?
Thanks

 

[brahmabreeder]

We need close ups of their heads.

 

[my sunwolf]

And how old they are would be helpful

 

[donrae]

Two look like cockerels, one probably pullet and one can't tell.

 

[lori stetson]

That's what I got too.