Over the years I have met three mums and children around the age of 8 walking the Camino.
I'm still not sure what the child was getting out of it, though I have to say that one young man he was 10 going on 30) enjoyed the experience though he found the walking hard.
It might be one those experiences that we have as children. At the time we hated it but years later look back and hug ourselves with joy for having experienced it.
I have walked with my (I'm never doing this again with you slow coach) son when he was 21 and 24; a wonderful experience.
In the mean time if you have not already got it, The Great Donkey Walk by Thomas Hinde and Susan Chitty will delight you. There is an update by their daughter Jessica. I have not read the Jesicca version, but have recently ordered it. I loved the original book. Amazon in the UK do used copies of both.
In 1998 I walked with a companion some 300 miles of the Camino. I found that it was not quite the Camino I wanted as I had to walk to his pace and timetable. We started out with my father, of which I have written elsewhere, and the story is in March 2011 CSJ Bulletin.
In 2004 I walked SJPP to Finisterre by myself, pleased only myself, and got the itch out of my system.
Since then until 2010 I have walked some part of the Camino every year. There have been a couple which were undertaken in haste, including the last one in 2010. These have left me with very mixed feelings.
I too have read Starkey's wonderful book. I need to warn you that since my first Camino in 1998 there have been some huge changes and what he writes about has, maybe to a large degree, gone.
That does not diminish the experience and you will find places where you will know that you are in a nexus point. You will have a heightened sense of the here and now but you will "feel" the presence of the millions who have gone before you and those who will come after you.
It does not happen very often but when it does you will know that being a pilgrim is more than a physical journey across topography and putting one foot in front of the other.
One final thought. If your child ever says, I want to go with you, go for it. Don't make huge, ambitious plans, Do what you can and return home. Don't push your child to do more than they are able. The day will come when you will do the Camino exactly as you want to do it but, in the mean time, don't miss the opportunity.
As I found out in 2004 the Camino will still be there for you to do it in your way, in your time, your route, at some later date. It's been there since 813AD; it's not going to disappear.
You will scratch your itch.