I live around the corner from a poultry and other farm. She breeds/hatches a couple handfuls of varieties of ducks/chicken/turkeys and goats and whatnot. Birds are offered straight run. I'm contemplating 2 more birds (either 2 easter eggers or an easter egger and a lavender orpington). She has day olds/week olds and then has some that are 3 to 4 week olds. They are straight run. We don't want/need a rooster, so we'd rather all girls. I have a buff orpinton who is 3 years old and has been a single chicken for almost 2 years. I picked up 2 more (black sex link and a barred rock) that are now 10 weeks old. They have been in the same coop for a month and last night I took down the fence between them. They have also been free range with the big chicken and the ducks for at least a month as well. That has gone well. What are the pros/cons for the day-week olds and the 3-4 week olds? My goal is friendly birds.