 Round about the 11th of July 1987, the world's population reached 5 billion people, and so the day of 5 billion was celebrated on the 11th of July that year. Since then, World Population Day is celebrated every year on the same date, as a United Nations initiative to raise awareness about the ever-increasing world population. With 11 July 2022 approaching, it will be fitting to look at a few interesting population facts. The current world population is 7.9 billion as of May 2022, according to the most recent United Nations estimates. The world population increases by about 83 million people every year. If populations continue to increase as they are now, there will be about 10 billion people worldwide by 2050. In 1950, about 30% of the world's population lived in urban areas, but today, more people live in urban areas than in rural areas. It is expected that by 2050, approximately 70% of the world's population will live in urban areas. Tokyo, Delhi, and Shanghai are the world's largest cities with between 28 and 38 million inhabitants per city. The world is aging rapidly. It is estimated that by 2050, people aged 60 will make up almost 22% of the global population. The three most populous nations in the world are China, India, and the USA. The country with the fastest growing population is Nigeria. It is estimated that Nigeria's population will have doubled by 2050. The independent city-state of Monaco is the second smallest sovereign state in the world. Monaco also has the most dense population in the world, with about 19,681 people per square kilometer. The global birth rate has fallen since the 1960s, and is expected to keep falling over the next few decades. However, the African population is growing, while the European population is shrinking. For example, Africa experience is about 4.7 births per woman, while Europe experience is 1.6. Finally, life expectancy is increasing. In 2000, the global life expectancy was 67 years old. Life expectancy is expected to continue growing, reaching 77 years old by 2050.