As of 2021, the estimated global population is around 7.9 billion people. Here are some key demographic statistics about the world:

• Age distribution: Approximately 26% of the world's population is under the age of 15, while 8% is aged 65 or older.

• Gender distribution: The global gender ratio is roughly 50.4% male and 49.6% female.

• Ethnicity: The world's population is very diverse, with over 6,500 distinct ethnic groups identified. The largest ethnic group is Han Chinese, who make up over 18% of the world's population.

• Religion: The most common religions in the world are Christianity, Islam, Hinduism, Buddhism, and Judaism.

• Language: There are over 7,000 living languages spoken in the world, with Mandarin Chinese being the most widely spoken.

• Urbanization: About 56% of the world's population lives in urban areas, with the majority of urban growth occurring in developing countries.

• Life expectancy: The global average life expectancy is around 73 years, with some countries having much higher or lower life expectancies depending on factors such as healthcare, sanitation, and nutrition.

• Fertility rate: The global fertility rate has been declining in recent years and is currently around 2.4 children per woman, with some countries having much higher or lower fertility rates depending on factors such as culture, education, and access to family planning.

• Migration: Millions of people migrate from one country to another each year for various reasons, including economic opportunities, political instability, and climate change.