question: why do days feel shorter the older we get?
comment: It has to do with the proportionality of time. Time feels faster the older we get because each new day represents less and less of a precentage of our life. For instance when you are 10 years older ~3650 days old (give or take because of leap years), one day would represent 1/3650 of your whole life or approximately .0274%. If you are let's say 40 years old or 14,600 days old, one measly day would represent 1/14,600 or .00685% of your entire lifetime. While time doesn't really speed up as we age, the time relative to our entire life is less significant and therefore we perceive that each second isn't as long as it used to be.
passages: Section::::Commercial performance.
   Day length fluctuations
  
  The length of the day, which has increased over the long term of Earth's history due to tidal effects, is also subject to fluctuations on a shorter scale of time. Exact measurements of time by atomic clocks and satellite laser ranging have revealed that the length of day (LOD) is subject to a number of different changes. These subtle variations have periods that range from a few weeks to a few years. They are attributed to interactions between the dynamic atmosphere and Earth itself. The International Earth Rotation and Reference Systems Service monitors the changes.
  
  Section::::Introduction.
   BULLET::::- Tidal drag between the Earth and the Moon and Sun increases the length of the day and of the month (by transferring angular momentum from the rotation of the Earth to the revolution of the Moon); since the apparent mean solar day is the unit with which we measure the length of the year in civil life, the length of the year appears to decrease. The rotation rate of the Earth is also changed by factors such as post-glacial rebound and sea level rise.
  
  Section::::Astronomical years.:Variation in the length of the year and the day.:Numerical value of year variation.
   The length of the mean solar day is slowly increasing due to the tidal acceleration of the Moon by the Earth and the corresponding slowing of Earth's rotation by the Moon.
  
  Section::::History.
   In adults in most societies, systolic blood pressure tends to rise from early adulthood onward, up to at least age 70; diastolic pressure tends to begin to rise at the same time but to start to fall earlier in mid-life, approximately age 55. Mean blood pressure rises from early adulthood, plateauing in mid-life, while pulse pressure rises quite markedly after the age of 40. Consequently, in many older people, systolic blood pressure often exceeds the normal adult range, if the diastolic pressure is in the normal range this is termed isolated systolic hypertension. The rise in pulse pressure with age is attributed to increased stiffness of the arteries. An age-related rise in blood pressure is not considered healthy and is not observed in some isolated unacculturated communities.
   Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes, and 4 seconds with respect to other, distant, stars (see below). Earth's rotation is slowing slightly with time; thus, a day was shorter in the past. This is due to the tidal effects the Moon has on Earth's rotation. Atomic clocks show that a modern-day is longer by about 1.7 milliseconds than a century ago, slowly increasing the rate at which UTC is adjusted by leap seconds. Analysis of historical astronomical records shows a slowing trend of about 2.3 milliseconds per century since the 8th century BCE.
   One day to an 11-year-old would be approximately 1/4,000 of their life, while one day to a 55-year-old would be approximately 1/20,000 of their life. This helps to explain why a random, ordinary day may therefore appear longer for a young child than an adult. The short term appears to go faster in proportion to the square root of the perceiver's age. So a year would be experienced by a 55-year-old as passing approximately 2¼ times more quickly than a year experienced by an 11-year-old. If long-term time perception is based solely on the proportionality of a person's age, then the following four periods in life would appear to be quantitatively equal: ages 5–10 (1x), ages 10–20 (2x), ages 20–40 (4x), age 40–80 (8x).
   In humans, ageing represents the accumulation of changes in a human being over time, encompassing physical, psychological, and social changes. Reaction time, for example, may slow with age, while knowledge of world events and wisdom may expand. Ageing is among the greatest known risk factors for most human diseases: of the roughly 150,000 people who die each day across the globe, about two thirds die from age-related causes.
   A 2006 study finds that relative age affects student performance and has long-lasting effects on life outcomes. The authors find that "the youngest members of each cohort score 4–12 percentiles lower than the oldest members in grade four and 2–9 percentiles lower in grade eight… data from Canada and the United States show that the youngest members of each cohort are even less likely to attend university."
  
  A 2014 study finds that Italian students born in the early months of the year "are more likely to be tracked in more academic schools rather than in vocational schools."
  
  Section::::In leadership positions.
   Section::::Medical assessment.
   Crustal movements (such as continental drift) or polar cap melting are slow secular events. The characteristic coupling time between core and mantle has been estimated to be on the order of ten years, and the so-called 'decade fluctuations' of Earth's rotation rate are thought to result from fluctuations within the core, transferred to the mantle. The length of day (LOD) varies significantly even for time scales from a few years down to weeks (Figure), and the observed fluctuations in the LOD - after eliminating the effects of external torques - are a direct consequence of the action of internal torques. These short term fluctuations are very probably generated by the interaction between the solid Earth and the atmosphere.
   Section::::On other planets.
   Section::::Observations.
   Section::::Life.:Declining health and death.
   The expected distribution of births in any given month across a population correlates closely to the number of days in the month, with February as the shortest month having the fewest births. The first graph shows the distribution of births, by month, for the European Union over the ten years from 2000 to 2009. There is a slight but clearly perceptible increase in the birth rate in the summer months.
   A study supported by the US National Institute on Aging found significant associations between month of birth and longevity, with individuals born in September–November having a higher likelihood of becoming centenarians compared to March-born individuals.
  
  In the United States, a 2010 Census Bureau report found that more than 80 percent of centenarians are women.
  
  Section::::See also.
  
  BULLET::::- Centenarian
  
  BULLET::::- Food preferences in older adults and seniors
  
  BULLET::::- New England Centenarian Study
  
  BULLET::::- Okinawa Centenarian Study
  
  BULLET::::- (study project of UC San Diego Health)
  
  Section::::External links.
  
  BULLET::::- The Okinawa Centenarian Study
  
  BULLET::::- New England Centenarian Study
  
  BULLET::::- New England Supercentenarian Study
   Marchetti posits that although forms of urban planning and transport may change, and although some live in villages and others in cities, people gradually adjust their lives to their conditions (including location of their homes relative to their workplace) such that the average travel time stays approximately constant. Ever since Neolithic times, people have kept the average time spent per day for travel the same, even though the distance may increase due to the advancements in the means of transportation. In his 1934 book "Technics and Civilization", Lewis Mumford attributes this observation to Bertrand Russell:
   According to this model, stage transitions between age intervals represent self-organization processes at multiple levels (e.g., molecules, genes, cell, organ, organ system, organism, behavior, and environment). For example, at the stage transition from adolescence to young adulthood, and after reaching the critical point of 18 years of age (young adulthood), a peak in testosterone is observed in males and the period of optimal fertility begins in females. Similarly, at age 30 optimal fertility begins to decline in females, and at the stage transition from middle adulthood to older adulthood at 48 years, the average age of onset of menopause occurs.
   In "Old Alex", O'Donnell makes it clear that fictional Modesty has a different rate of ageing than real people. The "Old Alex" story is set in 1997, so assuming that stories in the first books took place around 1965–1970, then Blaise aged something like eight years during an actual 30-year period.
   On time scales of thousands of years, the Gregorian calendar falls behind the astronomical seasons. This is because the Earth's speed of rotation is gradually slowing down, which makes each day slightly longer over time (see tidal acceleration and leap second) while the year maintains a more uniform duration.
  
  Section::::Accuracy.:Calendar seasonal error.
  
  This image shows the difference between the Gregorian calendar and the astronomical seasons.
  
  The "y"-axis is the date in June and the "x"-axis is Gregorian calendar years.
   The difference is 1.3 s from 1960 to 2040. Therefore, over this restricted range of years is an approximation to EOT whose error is in the range 0.1 to 2.5 s depending on the longitude correction in the equation of the equinoxes; for many purposes, for example correcting a sundial, this accuracy is more than good enough.
  
  Section::::Calculating the equation of time.:Right ascension calculation.
   The slightly longer "true" sidereal period is measured as the Earth Rotation Angle (ERA), formerly the stellar angle. An increase of 360° in the ERA is a full rotation of the Earth.
  
  Because Earth orbits the Sun once a year, the sidereal time at any given place and time will gain about four minutes against local civil time, every 24 hours, until, after a year has passed, one additional sidereal "day" has elapsed compared to the number of solar days that have gone by.
  
  Section::::Comparison to solar time.
   Section::::Exchange of angular momentum.
   Day &amp; Age
  
  Day & Age is the third studio album by American rock band The Killers. It was released on November 18, 2008, by Island Records. Frontman and lead vocalist Brandon Flowers stated that it is the band's "most playful record." , "Day & Age" has sold three million copies worldwide. Following the release of the album, the band embarked on the Day & Age World Tour.
  
  Section::::Production.
   Section::::Human evolution.:Growth pattern of children.
  
  Desmond Collins who was an Extension Lecturer of Archaeology at London University said that the lengthened youth period of humans is part of neoteny.
  