I've had them going on two weeks, and when I got them I was told they were 10-12 weeks (so today, 11.5 to 13.5 weeks). But I estimate at least the one might possibly be up to a few weeks younger based on pics I've seen of other speckled sussex chickens (I'm no expert though!).
Any help appreciated!
And yes they are inside... they came to me with coccidia, got better, and now I have to learn how to harden them off again so they can go back to their coop.