Statistical significanceIn statistical hypothesis testing, a result has statistical significance when a result at least as "extreme" would be very infrequent if the null hypothesis were true. More precisely, a study's defined significance level, denoted by , is the probability of the study rejecting the null hypothesis, given that the null hypothesis is true; and the p-value of a result, , is the probability of obtaining a result at least as extreme, given that the null hypothesis is true. The result is statistically significant, by the standards of the study, when .
LongevityLongevity may refer to especially long-lived members of a population, whereas life expectancy is defined statistically as the average number of years remaining at a given age. For example, a population's life expectancy at birth is the same as the average age at death for all people born in the same year (in the case of cohorts). Longevity studies may involve putative methods to extend life. Longevity has been a topic not only for the scientific community but also for writers of travel, science fiction, and utopian novels.
QuartileIn statistics, a quartile is a type of quantile which divides the number of data points into four parts, or quarters, of more-or-less equal size. The data must be ordered from smallest to largest to compute quartiles; as such, quartiles are a form of order statistic. The three main quartiles are as follows: The first quartile (Q1) is defined as the middle number between the smallest number (minimum) and the median of the data set. It is also known as the lower quartile, as 25% of the data is below this point.
Ages of ManThe Ages of Man are the historical stages of human existence according to Greek mythology and its subsequent Roman interpretation. Both Hesiod and Ovid offered accounts of the successive ages of humanity, which tend to progress from an original, long-gone age in which humans enjoyed a nearly divine existence to the current age of the writer, in which humans are beset by innumerable pains and evils. In the two accounts that survive from Ancient Greece and Rome, this degradation of the human condition over time is indicated symbolically with metals of successively decreasing value (but increasing hardness).
Longevity escape velocityIn the life extension movement, longevity escape velocity (LEV), actuarial escape velocity or biological escape velocity is a hypothetical situation in which one's remaining life expectancy (not life expectancy at birth) is extended longer than the time that is passing. For example, in a given year in which longevity escape velocity would be maintained, technological advances would increase people's remaining life expectancy more than the year that just went by.
Golden AgeThe term Golden Age comes from Greek mythology, particularly the Works and Days of Hesiod, and is part of the description of temporal decline of the state of peoples through five Ages, Gold being the first and the one during which the Golden Race of humanity (χρύσεον γένος chrýseon génos) lived. After the end of the first age was the Silver, then the Bronze, after this the Heroic age, with the fifth and current age being Iron. By extension, "Golden Age" denotes a period of primordial peace, harmony, stability, and prosperity.
Life tableIn actuarial science and demography, a life table (also called a mortality table or actuarial table) is a table which shows, for each age, what the probability is that a person of that age will die before their next birthday ("probability of death"). In other words, it represents the survivorship of people from a certain population. They can also be explained as a long-term mathematical way to measure a population's longevity. Tables have been created by demographers including John Graunt, Reed and Merrell, Keyfitz, and Greville.
Stone AgeThe Stone Age was a broad prehistoric period during which stone was widely used to make stone tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years and ended between 4,000 BC and 2,000 BC, with the advent of metalworking. Though some simple metalworking of malleable metals, particularly the use of gold and copper for purposes of ornamentation, was known in the Stone Age, it is the melting and smelting of copper that marks the end of the Stone Age.
