List of countries by population (United Nations) in the context of "China"

India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by area; the most populous country since 2023; and, since its independence in 1947, the world's most populous democracy. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal, and Bhutan to the north; and Bangladesh and Myanmar to the east. In the Indian Ocean, India is near Sri Lanka and the Maldives; its Andaman and Nicobar Islands share a maritime border with Myanmar, Thailand, and Indonesia.

Modern humans arrived on the Indian subcontinent from Africa no later than 55,000 years ago. Their long occupation, predominantly in isolation as hunter-gatherers, has made the region highly diverse. Settled life emerged on the subcontinent in the western margins of the Indus river basin 9,000 years ago, evolving gradually into the Indus Valley Civilisation of the third millennium BCE. By 1200 BCE, an archaic form of Sanskrit, an Indo-European language, had diffused into India from the northwest. Its hymns recorded the early dawnings of Hinduism in India. India's pre-existing Dravidian languages were supplanted in the northern regions. By 400 BCE, caste had emerged within Hinduism, and Buddhism and Jainism had arisen, proclaiming social orders unlinked to heredity. Early political consolidations gave rise to the loose-knit Maurya and Gupta Empires. Widespread creativity suffused this era, but the status of women declined, and untouchability became an organised belief. In South India, the Middle kingdoms exported Dravidian language scripts and religious cultures to the kingdoms of Southeast Asia.

The People's Republic of China is the second most-populous country in the world with a population exceeding 1.4 billion, only surpassed by India.

China's population has a relatively small youth component, partially a result of the strict enforcement of China's one-child policy that was in effect from 1979 until 2015, which limited urban families to one child and rural families to two. As of 2022, Chinese state media reported the country's total fertility rate to be 1.09, one of the lowest in the world alongside South Korea, Taiwan, Hong Kong and Singapore.

The demography of Japan is monitored by National Institute of Population and Social Security Research (IPSS) and Statistics Bureau. As of April 2025, Japan's population was roughly 123.4 million people, and peaked at 128.5 million people in 2010. It is the 6th-most populous country in Asia, and the 11th-most populous country in the world.

In 2024, the median age of Japanese people was projected to be 49.9 years, the highest level since 1950, compared to 29.8 for India, 38.9 for the United States and 40.2 for China. Japan has the second highest median age in the world, behind only Monaco. An improved quality of life and regular health checks are two reasons why Japan has one of the highest life expectancies in the world.

The 2020s (pronounced "twenty-twenties" or "two thousand [and] twenties"; shortened to "the '20s" and also known as "The Twenties") is the current decade that began on 1 January 2020, and will end on 31 December 2029.

During the early part of this decade, the world population grew from 7.7 billion to over 8 billion people. In 2023, India overtook China to become the most populous country in the world. The COVID-19 pandemic and its aftermath marked the early 2020s. The first reports of the virus were published on 31 December 2019, though the first cases are said to have appeared nearly a month earlier. The pandemic led to a global economic recession, sustained rise in global inflation, and supply chain crisis. The World Health Organization declared the virus a global state of emergency. With multiple extreme weather events and ecological crises continuing to escalate, several world leaders have called the 2020s the "decisive decade" for climate action. The years 2023 and 2024 both broke yearly global temperature records, with 2024 breaching 1.5 °C above pre-industrial levels.