Determining age of young chickens?

[Bru1995]

Can anyone help me to determine the age of these 3 chickens. According to what the breeder told me the Sussex and Blue Leghorn should be 9 weeks now and the Rhode Island Red should be a few weeks older than that, but I'm not sure if that's right?



Blue Leghorn:






Sussex:






Rhode Island Red:

 

[Bear Foot Farm]

The breeder should know
Anything else will be a wild guess

 

[donrae]

That looks like it could be right.

 

[Bru1995]

Ok cool, Thanks a lot!
The reason I was wondering was because I also have a Faverolles and a Barnevelder that I bought at 5 weeks old and I've now had them for 6 weeks but they are still smaller than these 3
(about 2/3 size).