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The key for my technique is that the chicks have tiny doors to get to their safe place that the older birds cannot fit thru. Clutter in your run might help if you keep that in mind.

Age isn't really the decider. I've learned that early(4-6 weeks) integration works much better than waiting until they are 'the same size', but you've got to set the coop up to facilitate it. https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/