I think my mother was quite forward thinking compared with some. Apparently she wanted me to ask questions, rather than sit me down for "the talk". I was a bit slow, despite her hoping that listening to radio plays that might make me curious. Finally, when I was about 10, I asked how a woman knew she was going to have a baby before she started getting fat! That prompted a full, proper biological, explanation about periods and everything else.
When I went to a Guide camp, aged 11, she told me if by any chance I got my first period, I should go to the leader in charge of first aid and tell her, as supplies of pads were always part of the first aid kit.
We also were given a book in school, when we were about 12, so I think all my classmates were well informed.
I was 13 when I started, but never had that much bother with periods until peri-menopause when they got heavier. I used tampons mostly, but enjoyed the period free time when pregnant and breastfeeding.