There is no minimum age to walk any Camino. However, there is a minimum age to receive your own Compostela. In general, a pilgrim requesting a Compostela, and meeting all of the other conditions (credencial, sellos, distance etc.) must have:
- (if Catholic) received their first Holy Communion - they might ask if in doubt - OR
- reached ten years of age - considered the cut-off point for children to understand what they have just accomplished, within the historical and cultural context.
This is why children in strollers, carriages, and papoose carriers do not get their own Compostelas.
One year, there was a young Korean boy who did the entire
Camino Frances, with his parents, using a stand-up push-type scooter when possible. But, he walked his own pilgrimage - the whole 800 Km. As I recall he was nine-years old. They gave him a Compostela - it was a judgement call.
I thought I read somewhere above that the children involved in this current Camino, were young teens. Assuming this is correct, they should have no problems requesting their own Compostelas.
In the past, in cases like this, where parents show up with young children, we have suggested a Distance Certificate issued to the "Familia Perez-Lopez," etc. in lieu of a Compostela to the child.
Hope this helps,
Tom