This is a traditional Isaan (northeastern) Thai soup that grandma said she first had when she was about three-years-old. Though we haven’t started to give our five-year-old daughter any spicy Thai food yet, those that grew up in the northeast have been eating it since they were babies. I have seen kids as young as 2-3 years old eating spicy food here. I don’t know if it’s right. The kids aren’t crying, they enjoy it I guess. Maybe they don’t understand pain in the same way we do in the USA. Lol. In the US, we think anything spicy hurts. Maybe they look at it differently in Thailand? Not sure.