mixing chicks??? and are they boys or girls???

[Sam40]

Hi. I have 2 chicks outside 10 weeks old and 3 chicks 4 weeks old that are out growing there brooder can i put them together? and how do i do this? It is quite cold here now are the younger chicks to young to go outside yet? Advise needed please.
I also am unsure if the the 2 older ones are boys or girls? I'll try and put on a photo.

Cheers Sam
buff sussex and welsummer at 10 weeks.

 

[Pelican49]

Do the ones in the picture have a roost they can get on to get off the cold ground? How cold is it? Are the younger ones completely feathered out? How much space do they have?

 

[Sam40]

Hi, they are in a small chicken coop that is suitable for 3-4 full grown chicken, at the moment i have taken perches out. these 2 sleep together in a nesting boxes within the hut, then there is an outside run. temp varies from 14 to 4c. The other alternative i have isto put them in the garage, but i was concerned about them not getting natural light, at the moment thee ypunger ones are in the brooder in the house.