In Hong Kong, 30s to 60s are populous generations, while the proportion of people in their 40s to 70s is large in Japan. 
Although the proportion of people in their 20s to 60s in the total population is larger than in Japan, looking at 10s years old to 40s, the younger the age group, the smaller the population.

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This report focuses on “marriage”—a major turning point in life that significantly alters consumer behavior—and explores the cultures and customs deeply rooted in various Asian countries.
How does consumer behavior change as people transition from single life to marriage and parenthood? By analyzing the significant event of marriage, we offer insights that will help you gain a more comprehensive understanding of Asian consumers.
 
How Do “Marriages” Differ Across Asian Countries!? And the Consumption Behaviors That Come With Marriage ~ Bride Price? Groom Price? What About the Funds? ~
・How are “weddings” conducted in various Asian countries?
・Consumption Patterns Related to Marriage: Preparations and Purchases Made Upon Getting Married
etc.

Reference
United Nations ”World Population Prospects 2024”
Retrieved Aug 23, 2024, from https://population.un.org/wpp/Download/Standard/Population/