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The development of memory in children becomes evident within the first 3 years of a child's life as they show considerable advances in [[declarative memory]], a child's memory throughout their development.<ref name="Learning & memory">{{Cite book|title=Learning & memory|date=2003|publisher=Macmillan Reference USA|others=Byrne, John H.|isbn=0-02-865619-9|edition=2nd|___location=New York|oclc=49977789}}</ref> This enhancement continues into adolescence with major developments in [[short term memory]], [[working memory]], [[long term memory]] and [[autobiographical memory]].<ref name="bad">{{cite book|last=Siegler|first=R. S.|title=Children's Thinking|year=1998|publisher=Prentice Hall|___location=Upper Saddle River, NJ|edition=3rd|authorlink=Robert S. Siegler|isbn=978-0-13-397910-7}}{{page needed|date=August 2016}}</ref>
The development of memory in adults, especially older adults, is often seen more negatively. Most adults will face symptoms of memory loss in both their short- and long-term memory; Alzheimer's is a prime example of this.<ref>{{Cite journal|last1=Jørgensen|first1=Isabella Friis|last2=
Recent research on the development of memory has indicated that declarative, or explicit memory, may exist in infants who are even younger than two years old. For example, newborns who are less than 3 days old demonstrate a preference for their mother's own voice, demonstrating the significance of a strong and powerful connection to the mother.<ref>{{cite journal |last1=DeCasper |first1=A. |last2=Fifer |first2=W. |title=Of human bonding: newborns prefer their mothers' voices |journal=Science |volume=208 |issue=4448 |pages=1174–6 |year=1980 |pmid=7375928 |doi=10.1126/science.7375928 |bibcode=1980Sci...208.1174D |citeseerx=10.1.1.553.1738 }}</ref>
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=== Adults ===
Memory tends to begin to fade as when enter and go through adulthood. Professor Ane-Victoria Idland et al.,<ref name=":0">{{Cite journal|last1=Idland|first1=Ane-Victoria|last2=Sala-Llonch|first2=Roser|last3=Watne|first3=Leiv Otto|last4=Brækhus|first4=Anne|last5=Hansson|first5=Oskar|last6=Blennow|first6=Kaj|last7=Zetterberg|first7=Henrik|last8=Sørensen|first8=Øystein|last9=Walhovd|first9=Kristine Beate|last10=Wyller|first10=Torgeir Bruun|last11=Fjell|first11=Anders Martin|date=September 2020|title=Biomarker profiling beyond amyloid and tau: cerebrospinal fluid markers, hippocampal atrophy, and memory change in cognitively unimpaired older adults|journal=Neurobiology of Aging|language=en|volume=93|pages=1–15|doi=10.1016/j.neurobiolaging.2020.04.002|pmid=32438258|s2cid=215767584|doi-access=free|hdl=2445/177677|hdl-access=free}}</ref> investigated the biological factors that begin to form in a person's older life and examined biological markers that could help explain the decrease in memory. They focused on beta amyloid 1–42 (Aβ42), phosphorylated tau (P-tau), total tau, chitinase-3-like protein 1 (YKL-40), fatty acid binding protein 3 (FABP3), and neurofilament light (NFL),<ref name=":0" /> and their findings suggest that tauopathy and FABP3 tended to be associated with the most memory decline. As individuals age, the hippocampus appears to begin to lose its ability to make connections to life events and memory.<ref>{{Cite journal|last1=Dahan|first1=Lionel|last2=Rampon|first2=Claire|last3=Florian|first3=Cédrick|date=August 2020|title=Age-related memory decline, dysfunction of the hippocampus and therapeutic opportunities|journal=Progress in Neuro-Psychopharmacology and Biological Psychiatry|language=en|volume=102|pages=109943|doi=10.1016/j.pnpbp.2020.109943|pmid=32298784|s2cid=215753906|doi-access=free}}</ref>
==Episodic memory==
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By school age, the typical child shows skill in recalling details of past experiences and in organizing those details into a [[narrative]] form with [[:wikt:cohesion|cohesion]]. Memories formed at this age and beyond are more likely to stand the test of time over the years and be recalled in adulthood, compared to earlier memories. Young children can sometimes retain information from specific episodes over very long periods of time, but the particular information a child of a particular age is likely to retain over different periods of time is unpredictable. This depends on the nature of the memory event and individual differences in the child such as gender, parental style of communication, and language ability.<ref name="fivush">{{cite journal |last1=Fivush |first1=Robyn |last2=Gray |first2=Jacquelyn T. |last3=Fromhoff |first3=Fayne A. |title=Two-year-old talk about the past |journal=Cognitive Development |volume=2 |issue=4 |year=1987 |pages=393–409 |doi=10.1016/S0885-2014(87)80015-1 }}</ref>
One of the most important aspects of episodic memory according to Psychologist Endel Tulving (1985, 1999) is the element of the individual to cognitively travel to both the past and the future.<ref name="John Wiley & Sons Ltd">{{Cite book|title=The Wiley Handbook on the Development of Children's Memory: Bauer/The Wiley|date=2013-10-07|publisher=John Wiley & Sons Ltd|isbn=978-1-118-59770-5|editor-last=Bauer|editor-first=Patricia J.|___location=Chichester, UK|language=en|doi=10.1002/9781118597705|editor-last2=Fivush|editor-first2=Robyn}}</ref> A studied yet still speculative thought about episodic memory in children is the lack of and anticipated episodic.<ref name="John Wiley & Sons Ltd"/> This suggests that children are more susceptible and successful in remembering certain events (e.g., what are you going to have for lunch, what will you play with in the park, etc.), not because they traveled in both past and future, but that parents are the ones’ who generally organize the day, meaning they are the ones who have control over their children's futures.<ref name="John Wiley & Sons Ltd"/>
As with all forms of memory, Episodic Memory is known to also decline with age. However, it can also be said that biological factors such as one's sex also affects how Episodic memory develops and degrades. In a study done by Professor Astri J. Lundervold et al.,<ref>{{Cite journal|last1=Lundervold|first1=Astri J.|last2=Wollschläger|first2=Daniel|last3=Wehling|first3=Eike|date=June 2014|title=Age and sex related changes in episodic memory function in middle aged and older adults|journal=Scandinavian Journal of Psychology|language=en|volume=55|issue=3|pages=225–232|doi=10.1111/sjop.12114|pmc=4314696|pmid=24601911}}</ref> they decided to investigate the possible reasons behind this. Their findings through several longitudinal and cross-sectional studies found that as mentioned that Episodic memory does decrease with age. In regards to sex they found that women tend to have a slightly lower decrease rate of Episodic Memory than men, -.12 compared to -.14 units. They study however didn't go into other variables such as social-economical-status in regards to how this might affect the decrease rates in age and sex.
==Autobiographical memory==
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Difficulty in assessing memory in young children can be attributed to their level of language skills; this is because memory tests usually occur in the form of a verbal report. It is unclear whether performance on memory assessments is due to poor memory for the event or to the inability to express what they remember in words. However, memory tests assessing performance with a nonverbal photograph recognition test and behavioral re-enactment showed that children had signs of recall from 27 months, as opposed to 33 months using verbal recall testing.<ref>{{cite journal|last1=Simcock|first1=Gabrielle|last2=Hayne|first2=Harlene|year=2003|title=Age-related changes in verbal and nonverbal memory during early childhood|journal=Developmental Psychology|volume=39|issue=5|pages=805–14|doi=10.1037/0012-1649.39.5.805|pmid=12952395}}</ref>
Autobiographical memory development is related to the emotional state of both children and adults. Professor Leslie Rollins et al.(2018), <ref>{{Cite journal|last1=Rollins|first1=Leslie|last2=Gibbons|first2=Jeffrey A.|last3=Cloude|first3=Elizabeth B.|date=July 2018|title=Affective change greater for unpleasant than pleasant events in autobiographical memory of children and adults: A retrospective study|journal=Cognitive Development|language=en|volume=47|pages=46–52|doi=10.1016/j.cogdev.2018.03.002|s2cid=149260200 }}</ref> showed that particularly bad experiences tended to degrade, to be forgotten, and were more related to difficulties remembering than positive memories.
===Childhood amnesia===
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