In South Korea, the average age of the population rose from below 20 years in the late-70s to around 45 years today, and it is projected to rise to over 62 years in 2074.
Several factors contribute to the longevity of South Korean people. These include a diet rich in vegetables, fish, and fermented foods, an active lifestyle with a focus on physical activity like walking and hiking, strong social connections, and access to advanced healthcare.
Monaco is the country with the highest median age in the world. The population has a median age of around 56 years, which is around six years more than in Japan and Saint Pierre and Miquelon – the other countries that make up the top three.
The population density in Japan is 338 per Km2 (875 people per mi2). The total land area is 364,555 Km2 (140,755 sq. miles). 93.1 % of the population is urban (114,645,589 people in 2025). The median age in Japan is 49.8 years.
The term "juveniles" as used in this Act means persons under 19 years of age, and the term "guardian" means any person who has the legal obligation to take care of, supervise and protect, and educate juveniles, or any person who is presently supervising and protecting juveniles.
Demographics. The youngest countries in the world are located in Africa. The youngest of them all is Niger at a median age of just 15 years - meaning that an equal amount of people in the country are older and younger than 15.
Men born in Chad have the lowest life expectancy in the world as of 2024, reaching only 53 years. The lowest life expectancy for women in the world in 2024 was for girls born in Nigeria, with only 55 years. Except for Afghanistan, all the countries with the lowest life expectancy in the world are in Africa.
The median age in Mexico is 29.3 years (2024).
South Sudan – the youngest country in the world
The Republic of South Sudan, an African nation that gained sovereignty from Sudan on July 9, 2011, is the world's newest formally acknowledged nation (as of 2025, according to Britannica).
Based on the National Health Interview Surveys conducted by the Centers for Disease Control and Prevention, fewer Korean Americans report chronic health conditions such as heart disease, hypertension, asthma, cancer and diabetes than Non-Hispanic Whites (3).
According to official estimates, about 15% of South Koreans live below the poverty line. Poverty in South Korea is defined as relative poverty. Relative poverty is not the same as absolute poverty: relative poverty measures the share of the population living on less than half of the median income.
In Korea, the average household net-adjusted disposable income per capita is USD 24 590 a year, less than the OECD average of USD 30 490 a year. In terms of employment, about the same amount of people aged 15 to 64 in Korea have a paid job as the OECD employment average of 66%.
Subsequently, it has one of the oldest populations in the world, with a median age of 41.9 years. Map of Russia's population density at municipality level, based on the results of the 2021 census. Pop. ±% p.a.
The oldest state in the United States is Delaware, established in 1787, and the youngest is Hawaii, established in 1959. Delaware ratified the US Constitution on December 7, 1787, thus becoming the first state. The newest states are Alaska and Hawaii, with Alaska being admitted as the 49th state on January 3, 1959.
San Marino
This tiny nation on the Italian peninsula holds the Guinness World Record for the oldest existing republic in the world.
The lowest age of consent is in Nigeria (11), followed by the Philippines and Angola (12). The age of consent is 13 in three countries – Niger, Comoros, and Burkina Faso. The countries where the age of consent is 14 include a number of South American countries: Brazil, Columbia, Peru, Paraguay, Ecuador, and Bolivia.
High school. High schools in South Korea teach students for three years, from first grade (age 15–16) to third grade (age 17–18), and students commonly graduate at age 17 or 18.
Alcoholics Anonymous and its recovery program was first introduced to Korea by the Irish catholic Father Arthur M. (widely known as 'An shinbu' to Korean members) in the 1970s. In early the 1980s some A.A. groups were established in Seoul and Kwang-Ju city.
F. Fail. Below 50% 0.0. These tables outline the primary grading scales used within South Korean high schools and colleges/universities.