Children as young as 3 and 4 have gotten a compestella. The dividing line is if they can communicate that they "understood" the spiritual nature of their pilgrimage. It depends largely on the person at the desk. Some require full sentences, some yes's to pertinent questions, some simply shaking of head. Others would look at age of consent (i.e. communion), so 7 or so. It depends who you get at the desk. Our 14 month old did not qualify because he wasn't talking much at all yet, but the person at the desk gave him a chance. Just depends how sympathetic your desk person is.