The break between adult/child pricing (12 years) reflects the age - and assumed average height for that age - at which our research shows visitors will get the most out of their visit.
Anyone under 3 years of age doesn't require a ticket and will be admitted to the park free of charge. This reflects the height at which children, on average, are tall enough to use a high percentage of the rides at the Theme Park and therefore enjoy it equally with older guests. Adventurers over 0.9m in height are able to experience over 70% of our rides.
We hope this answers your question.