In the last decade of the 20th century, the human population will increase by 1 billion, but in the next 25 years it will approach 2 billion. A person born in 1920 shared this world with 1.5 billion people and now shares it with 6 billion people. In our lives, a rapidly aging population (> 65 years old) and very old (> 85) populations are formed. As the elderly population triples, a 20-35% decline in the number of children is foreseen.
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