Hi All! So glad I found you! Thank you Justso for directing me here!
I'm a newbie in the far west Chicago suburbs. I received (6) "4-9 week old" pullets the last week of February from McMurray. I think they were pretty close to 4 weeks old but you guys can probably tell me better...
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So on April 1st I lost one of them. Today they would be close to 11 weeks old if they were 4 weeks old when I received them.
So today I received a "started pullet" who could be 15 - 22 weeks old from McMurry. I'm sure you guys can tell me approx how old she is...
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That's a terrible picture!!! So I have her next to but separate from the others with her own shelter, food and water. I will probably bring her in the house at night since the run addition is not as critter proof as the main coop, and since winter will not go away!!
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So what I am wondering is since my existing flock are all young, and obviously younger than the new hen, will it be easier to integrate her into the flock? Or will that not matter?

I'm in DuPage and only about 30 min from you.
You should have no troubles integrating your flock. Whenever the number of the younger birds outnumbers the older ones, it's pretty easy. (ie, I have a handful of 2 wk old chicks that we didn't sell, so I added them to the big brooder full of babies. They all play nice together.) If reverse & adding just 1-2 babies into an older group, the bigger ones may gang up. It can be done, but it takes longer. When in doubt, always use the look but don't peck method. Better to intro slowly & safely than deal with pecking & added stress.