What age are these books suitable for?

[trainboundfornowhere]

My eldest DN will be 9 and a half at Christmas and I was going to buy Flour Babies and Madame Doubtfire by Anne Fine and The Extremely Embarrassing Life of Lottie Brooks by Katie Kirby. DM has now got me doubting if these books are age appropriate I suspect because she let me read whatever I wanted at that age without vetting anything. In fairness I never read anything that disturbed or upset me at that age though some of it did make me feel sad. I loved history and still do to this day and was aware of the unsanitised bits even as a child. What age do others think these books are appropriate for?

I always check books by googling the title + the word “book trust”. Book Trust gives you a interest age range and reading age.
Book Trust gives Flour Babies 9-12 years and The Extremely Embarrassing …. 12-14 years.

I can’t find Doubtfire on there.

These are good for 9 years olds:

The 13-Storey Treehouse
The Last Bear
Varjak Paw
The Nowhere Emporium
There’s a Boy in the Girls’ Bathroom
The Explorer
Wonder

My sister used to buy a lot of books for my children but she would always suggest titles and ask me if she should get them. Not because I was bothered about what age they were meant to be for, but because she wanted to know if I thought they would like them/had read them already etc.
I found that they would rather read books intended for older children than read books that they found too young. I've never vetted a book either, any book they wanted to read I was happy with.