!!!Did you know this about Japan? Did you know that Japan is very low in ranking among 193 countries in the following 4 respects. #Age Structure: 0-14 years - %: 13.2 (Rank 190). #Age Structure: 15-24 years - %: 9.7 (Rank 190). #Birth rate - births/1,000 population: 8.07 (Rank 192). #Infant mortality rate - deaths/1,000 live births: 2.13 (Rank 191).