To think colouring books are no good for any age kids?

[Purplesky2]

Dd 3 scribbles in them.
Ds1 and ds2 are 6 and 7 and really not bothered. Could it be they are only for 4 and 5 year olds?! (Mine didn't do them at 4 or 5 either though)

It all depends on the child. My dsd has never been one for colouring, she'd spend at most five minutes colouring. My eldest dd will happily colour for hours, dd2 and ds are somewhere in between. I have a more complicated colouring book and it's a great way to chill out after a frantic day of kids and study when I'm too mentally exhausted to read.

All of then started off scribbling in couponing books and have got better ad they've grown.

It depends on the child DD1 wasn't / isn't bothered about drawing/colouring. DD2 depends on her mood will colour although she prefers doing school workbooks, and DS loves to draw/colour.

Yabu to make such a sweeping statement based on just your kids
My ds enjoyed them, dd1 wasn't interested, dtds 8 love them. Down to the individual child.