From the paper, they are going by body weight, and then a conservative age as a proxy: “To ensure safe population-level recommendations can be easily interpret

From the paper, they are going by body weight, and then a conservative age as a proxy: “To ensure safe population-level recommendations can be easily interpreted at the individual parental level, and given the variability across an age cohort of weight, we suggest that recommendations should be based on weight rather than age. “Alternatively, the recommended age threshold may need to be higher (eight years), to ensure the dose per weight would not be exceeded given normal population variation in weight.” This is quoted at the end of the Guardian article, which is better than the Sky one: https://www.theguardian.com/society/2025/mar/12/under-eights-should-not-drink-slushies-containing-glycerol-say-doctors https://www.theguardian.com/society/2025/mar/12/under-eights...