Dd2 is 8 and a half. I did explain to her about periods a long time ago but she seemed to have forgotten and asked me again about it so I explained and she burst into tears and said that can never happen to her!
Then 5 minutes later she asked if I thought her life would have been happier if she was a bird(!)
I tried explaining that it happens to us all and is no big deal and that anyway she shouldn't worry yet because I didn't start until I was 14 but this didn't seem to help at all...
She has just started needing a deodorant and I feel at her age she should know about periods. I don't understand why she's so scared - I was totally non plussed when my mum told me about it.