Not too young... anything past 3 or 4 days start to run out to greet us when we walk into the broody areas. Usually there is 1 who we label 'the greeter', it is the lookout who runs out first, followed shortly by the others once they hear the greeter making noise. Hen usually follows a bit behind once all the chicks scramble out from under her.The chicks were crying in the run while I was in the coop. I tossed out scratch, and they shut up.They are “too young” to know that I offer scratch.