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The expected number of people needed until every birthday is achieved is called the Coupon collector's problem. It can be calculated by nH n, where H n is the n th harmonic number. For 365 possible dates (the birthday problem), the answer is 2365.
The birthday effect (sometimes called the birthday blues, especially when referring specifically to suicide) is a statistical phenomenon where an individual's likelihood of death appears to increase on or close to their birthday. The birthday effect has been seen in studies of general populations in England and Wales, [ 1] Switzerland, [ 2][ 3 ...
The oldest person ever whose age has been independently verified is Jeanne Calment (1875–1997) of France, who lived to the age of 122 years and 164 days. [ b] The oldest verified man ever is Jiroemon Kimura (1897–2013) of Japan, who lived to the age of 116 years and 54 days. The oldest known living person is Tomiko Itooka of Japan, aged 116 ...
Centenarian. A centenarian is a person who has reached the age of 100 years. Because life expectancies worldwide are below 100, the term is invariably associated with longevity. The United Nations estimated that there were 316,600 living centenarians worldwide in 2012, [ 1] and 573,000 in 2020, almost quadruple the 2000 estimate of 151,000.
In world demographics, the world population is the total number of humans currently alive. It was estimated by the United Nations to have exceeded eight billion in mid-November 2022. It took around 300,000 years of human prehistory and history for the human population to reach a billion and only 218 years more to reach 8 billion.
Traditional East Asian age reckoning covers a group of related methods for reckoning human ages practiced in the East Asian cultural sphere, where age is the number of calendar years in which a person has been alive; it starts at 1 at birth and increases at each New Year. Ages calculated this way are always 1 or 2 years greater than ages that ...
Only half of the people born in the early 19th century made it past their 50th birthday. In contrast, 97% of the people born in 21st century England and Wales can expect to live longer than 50 years. [44] 19th-century British India [48] 25.4: 19th-century world average [44] 28.5–32
Happy birthday! Stay golden, girl. Your friendship means the world to me. Thank you for being YOU. Happy birthday, friend. True friends are there through the good times and the bad.