What is the fine-grained topic of the following text: Although all children are different and motivation is crucial on walking tours, we have tried to apply a rough “child suitability factor” to the walks which indicates a recommended lowest age: Very high = 2−3 yrs, High = 4−5 yrs, Medium = 6−7 yrs and Low = 8 years and older. Only return the topic.
Recommended Age for Walking Tours