oooh..I have a question now...how did you explain menstruation?
We include it as part of our edcation about the reproductive system.
When they are very little and constantly follow me to the loo and they notice, say around 1yo, they get worried and might say "Mummy owie?" I say "no owie, vagina blood okay".
When they are a bit older, say 2yo, they might notice and say "just bagina blood, it okay" and I"ll start saying "yes, it means no baby this time".
When they are around 4yo I start looking in our Human Body book and it has a section on reproduction.
They help me do the laundry and see my cloth pads for the "bagina blood".
When I am pregnant I explain that this time there is no vagina blood for the duration of the pregnancy but that there will be a big period when the baby is born.
I can feel myself ovulate and it is quite sharp so I might stop what I am doing and say "ouch" which then requires an explanation and that is when we start to explain about ovulation and back to the Human Body book we go.
Sometimes a friend might have an eptopic pregnancy or similar and I have miscarried and birthed a sleeping baby so as those events arise they learn more.
Sometimes something will come up on a television show about contraception and we then explain that.
I take a moon day each month on the first day of my cycle if possible and on that day I relax a lot, treat myself to baths and special food, wear special clothes (not very special but extra loose around the tummy) and that teaches my boy and girls to honour the menstrual cycle for the amazing thing that it is.
I also use a menstrual cup and dilute the blood and use it on our garden so they understand about the cycle of life and the nutrients in blood and learn a bit more about gardening then also.
I have done a bit of menstrual blood art which they weren't too keen on but got over their ickiness and now they just take that in their stride.
The only downside to them being so clued in is that they will openly tell people all about it which most adults find a bit disconcerting. They actually know more than some adults about how it all works. My 11yo had to explain to an adult once that eggs aren't fertilised in the uterus but in the fallopian tubes.
I haven't reqached menopause yet but when I do I will share my experience with them just as I have shared my experience with puberty with them.