Why only for 10 year olds or younger?
I can tell you for a fact that the same vendor from a food court I frequent has increased their prices by ~50% over the past three years. Beef from Costco has increased ~15%-20%.
In Vancouver, it used to cost on average $20-$30 to go eat Dim Sum. Not it costs $40-$50 to get the same amount of food.
So unless income has increased by at least 40% (because of have to account for the increase in taxes paid as well), how is food getting cheaper if I want to continue eating the same food as before?