Here are a few tips we can offer based on ages of your child. (abbyslane.com)
There is an association between the mean values for hourly price by age of child in the following table, but the differences are smaller on an hourly basis than I would have guessed. (educationnext.org)
The data were collected between 2004 and 2010 with the average age of the children at the beginning of the collection between 10 and 12 years. (sciencedaily.com)