Simple answer, yeah. child enthusiasm itself is not a crime, the term child enthusiast refers to someone with a loveual attraction to children. Whether or not you act on it determines whether or not you are a criminal. If someone at 8 had the capacity to understand love and loveual arousal, then yes, they could be a child enthusiast. The question you probably meant to ask would be can an 8 year old be convicted of a love crime, probably stat rape or child molestation, and it probably depends on a ton of different factors like where you live, age gap between the offender and the victim, ect.