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What is the World Health Organization's distinction between young people, middle-aged people and the elderly?

In 2002, the United Nations World Health Organization redefined the criteria for dividing age stages: young people under 44 years old, middle-aged people aged 45-59 years old, young people aged 60-74 years old, elderly people aged 75-89 years old, and longevity people over 90 years old. The World Health Organization divides the age into five age groups, and postpones the human aging period by ten years, which will have a positive impact on people's psychology and anti-aging will.