In which of the following countries are people under 15 predominant in the age structure of the population?

Since there is no list of countries, I will write a line of reasoning:
For countries with a developed economy, with a high level of scientific and technological progress and a high level of quality of life, people who are much older than 15 will prevail, take, for example, developed countries in Europe (Switzerland).
But in the opposite case (a country in Africa, for example), the younger population will prevail.