I would put Doris as younger than 7 here if she is the little girl standing. She doesn't look 7 - more like 5/6 maybe. I think she is still quite little.
I'd put them at 5ish littlest one standing, 7-10ish seated, 12-13 standing, dog - no idea
I'd put them as the older girls (so before Olwen) because there is a bigger gap between the seated and standing.
