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The number of American women who do not have children by the age of 30 has grown, breaking previous fertility trends where younger women made up the bulk of births. While only 10% of women were childless in 1976 at the end of their reproductive years, it is projected that 25% of those born in 1992 will reach the same benchmark in 2032. [ 54 ]
This finding is generally stronger for men than women, [24] though the pattern between genders is not universal across all studies and some results suggest sex-based differences only appear in certain age groups, for certain causes of mortality and within a specific sub-set of self-ratings of health. [25]
Over 70 million adults in U.S. are obese (35 million men and 35 million women). 99 million are overweight (45 million women and 54 million men). [71] NHANES 2016 statistics showed that about 39.6% of American adults were obese. Men had an age-adjusted rate of 37.9% and Women had an age-adjusted rate of 41.1%. [69]
People under 15 years of age made up over a quarter of the world population (25.18%), and people age 65 and over made up nearly ten percent (9.69%) in 2021. [5] The world's literacy rate has increased dramatically in the last 40 years, from 66.7% in 1979 to 86.3% today. [13]
The difference in life expectancy between men and women in the United States dropped from 7.8 years in 1979 to 5.3 years in 2005, with women expected to live to age 80.1 in 2005. [88] Data from the United Kingdom shows the gap in life expectancy between men and women decreasing in later life.
For Hispanic women, the highest total fertility rate was in Alabama, at 3.085, and the lowest in Vermont, at 1.200, and Maine, at 1.281. [ 50 ] [ 51 ] As of 2016, due to aging, low birth rates and rising mortality driven partly by drug overdoses , deaths outnumber births among non-Hispanic whites in more than half the states in the country.
Percentage of the population over 65 in Europe in 2020 Population pyramid of the European Union in 2023 Europe population pyramid from 1950 to 2023. The ageing of Europe, also known as the greying of Europe, is a demographic phenomenon in Europe characterised by a decrease in fertility, a decrease in mortality rate, and a higher life expectancy among European populations. [1]
After age 30, the mass of the human body is decreased until 70 years and then shows damping oscillations. [24] People over 35 years of age are at increasing risk for losing strength in the ciliary muscle of the eyes, which leads to difficulty focusing on close objects, or presbyopia. [27] [28] Most people experience presbyopia by age 45–50. [29]