Would girls starting their periods at 10 or 11 have been common in the late 60s/ something that community professionals would publicly involve themselves in?
It wasn't common in the late 80s/early 90s and certainly wouldn't have warranted a campaign. The vast majority of us started at 12-14 (and older in some cases). Anyone starting younger was discretely helped by the school nurse and/or their mum.
We only had the period talk in Y7 and Y8 (Tampax lady 😁) and a bit of sex ed in Y6 and that seemed progressive for the time.
I just find the idea of the enthusiastic nun and nurse going into a primary school in the late 60s unfathomable, particularly without parents' knowledge.
Maybe I'm wrong!