The Wise Old Age of… 35? New Study Suggests Brain Power Peaks Early

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Key Takeaways

  • Most people's cognitive abilities peak at some point during midlife and deteriorate as they age.
  • Researchers analyzed the cognitive skills of professional chess players and found that after age 45, their skill level began to decline.
  • While some cognitive abilities decline with advancing age, others remain unchanged or even improve. 

It won't come as a great surprise that for most people, cognitive abilities peak at some point during midlife and deteriorate from then on. But a new study, published in Proceedings of the National Academy of Sciences, used an innovative way to demonstrate this—measuring the cognitive skills of professional chess players. 

Three researchers from Institut Polytechnique Paris analyzed player performance from around 24,000 professional chess matches over a period of 125 years, which involved examining the moves of 4,294 players—20 of whom were world champions.

By comparing each player’s chess moves against optimal moves proposed by a digital chess engine, the researchers discovered that performance ability reached a peak at about age 35. Most players were able to preserve that level for around 10 years. But after age 45, their skill level started to decline. 

Changes in cognitive ability reflect changes in the brain’s structure and chemistry, says University of Waterloo psychology professor Myra Fernandes, PhD. “As we enter midlife (mid-30s to 40s), the overall volume of the brain begins to shrink,” she explains. “The rate of shrinkage, which is due to the normal aging process and cell death (senescence), increases around age 60.”

Understanding Cognitive Decline

This cell death doesn’t occur uniformly throughout the brain. “Some regions experience more and faster rates: the prefrontal cortex, cerebellum, and hippocampus show the biggest losses, and this worsens with further advancing age,” says Fernandes. “Thus the functions subserved by these areas become selectively impaired.” 

This means that while some cognitive abilities decline with advancing age (during your 20s and 30s, according to a 2009 study), others actually remain stable or even increase, according to the American Psychological Association. 

Myra Fernandes, PhD

With age, committing new information to memory and recalling names of new acquaintances can take longer. Differentiating similar events, that occurred at different points in time, is particularly problematic.

— Myra Fernandes, PhD

“With age, committing new information to memory and recalling names of new acquaintances can take longer,” Fernandes says. “Differentiating similar events, that occurred at different points in time, is particularly problematic. For example, remembering where you parked your car on a specific occasion can sometimes be harder when the context is familiar: did I park near the food court today? Or was that where I parked last week, and today I parked closer to the bus stop?”  

Working memory, which is one’s ability to hold a piece of information in mind, such as a phone number, or password, also declines with age, Fernandes says.

But a number of other cognitive processes are well-maintained into advanced age. "Our vocabulary and crystallized intelligence, which includes general knowledge of the world and knowledge acquired through hobbies, professions, and other sources, tend to increase throughout the lifespan and only show declines in very advanced age," says Jennifer Coane, PhD, associate professor of psychology at Colby College in Maine. 

Jennifer Coane, PhD

A positive cognitive change that occurs in aging is that older adults tend to have what is referred to as a "positivity bias," meaning they attend to positive stimuli more and are more emotionally regulated than younger adults.

— Jennifer Coane, PhD

Procedural memories (overlearned motor routines) like remembering how to skate, how to ride a bike, or tie a shoe, remain largely intact, Fernandes adds.

Overall, the field of cognitive aging research offers many examples of declines in some cognitive processes and preservation in others. "A positive cognitive change that occurs in aging is that older adults tend to have what is referred to as a 'positivity bias,' meaning they attend to positive stimuli more and are more emotionally regulated than younger adults," says Coane.

What Affects Brain Power As We Age?

A number of factors affect cognitive ability besides biological age, Coane adds.

Physical health, in particular cardiovascular health, is associated with cognitive functioning, as is access to nutritious food and clean water. “As we age, we also tend to experience decreases in vision and hearing; both of these are associated with poorer performance in cognitive tasks,” says Coane. “Hearing loss in particular seems to be associated with more rapid cognitive decline.”

Other relevant factors include level and quality of education (research indicates that those who have more years of education tend to perform better on cognitive tasks as they age), and factors that increase the body’s stress response, such as poverty, racial discrimination, violence, lack of security, loneliness, and poor sleep—these can also have significant adverse effects on someone's cognitive health. 

Up For Debate

The specific age at which cognitive decline begins is a matter of some debate, largely because there are many discrepancies in published research. “There is a lot of variability across individuals, so it’s important to consider how different patterns of age-cognition present in the same individual who is re-tested over several years,” says Fernandes.

Discrepancies may also stem from which cognitive abilities are evaluated or whether between-group comparisons are made – these tend to under-report age-related cognitive declines, Fernandes notes. 

What This Means for You

You can keep your brain sharp by taking part in regular aerobic exercise and eating a nutritious diet, which both enhances blood flow to the brain and helps maintain healthy neurons. 

Experts also recommend reading and learning new skills or tasks to enhance mental stimulation. And maintaining positive social relationships keeps people more alert, motivated, and cognitively stimulated. 

20 Sources
Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Strittmatter A, Sunde U, Zegners D. Life cycle patterns of cognitive performance over the long run. Proc Natl Acad Sci U S A. 2020. doi:10.1073/pnas.2006653117 

  2. Mecocci P, Boccardi V, Cecchetti R, et al. A long journey into aging, brain aging, and alzheimer’s disease following the oxidative stress tracksJ Alzheimers Dis. 2018;62(3):1319-1335. doi:10.3233/JAD-170732

  3. Nyberg L, Lövdén M, Riklund K, Lindenberger U, Bäckman L. Memory aging and brain maintenance. Trends Cogn Sci. 2012;16(5):292-305. doi:10.1016/j.tics.2012.04.005

  4. Salthouse TA. When does age-related cognitive decline begin?Neurobiol Aging. 2009;30(4):507-514. doi:10.1016/j.neurobiolaging.2008.09.023

  5. Phiilips ML. American Psychological Association. The mind at midlife. 2011;24(4). 

  6. Murman DL. The impact of age on cognitionSemin Hear. 2015;36(3):111-121. doi:10.1055/s-0035-1555115

  7. Carstensen LL, DeLiema M. The positivity effect: a negativity bias in youth fades with ageCurr Opin Behav Sci. 2018;19:7-12. doi:10.1016/j.cobeha.2017.07.009

  8. Harada CN, Natelson Love MC, Triebel KL. Normal cognitive agingClin Geriatr Med. 2013;29(4):737-752. doi:10.1016/j.cger.2013.07.002

  9. Crichton GE, Elias MF, Davey A, Alkerwi A. Cardiovascular health and cognitive function: the maine-syracuse longitudinal studyPLoS One. 2014;9(3):e89317. doi:10.1371/journal.pone.0089317

  10. Smith PJ, Blumenthal JA. Dietary factors and cognitive declineJ Prev Alzheimers Dis. 2016;3(1):53-64. doi:10.14283/jpad.2015.71

  11. Bondy SC, Campbell A. Water quality and brain functionInt J Environ Res Public Health. 2017;15(1). doi:10.3390/ijerph15010002

  12. Lenehan ME, Summers MJ, Saunders NL, Summers JJ, Vickers JC. Relationship between education and age-related cognitive decline: a review of recent researchPsychogeriatrics. 2015;15(2):154-162. doi:10.1111/psyg.12083

  13. Scott SB, Graham-Engeland JE, Engeland CG, et al. The effects of stress on cognitive aging, physiology and emotion (Escape) projectBMC Psychiatry. 2015;15:146. doi:10.1186/s12888-015-0497-7

  14. Wu F, Guo Y, Zheng Y, et al. Social-economic status and cognitive performance among chinese aged 50 years and olderPLoS One. 2016;11(11):e0166986. doi:10.1371/journal.pone.0166986

  15. Barnes LL, Lewis TT, Begeny CT, Yu L, Bennett DA, Wilson RS. Perceived discrimination and cognition in older African AmericansJ Int Neuropsychol Soc. 2012;18(5):856-865. doi:10.1017/S1355617712000628

  16. Zhou Z, Mao F, Zhang W, Towne SD, Wang P, Fang Y. The association between loneliness and cognitive impairment among older men and women in china: a nationwide longitudinal studyInt J Environ Res Public Health. 2019;16(16). doi:10.3390/ijerph16162877

  17. Spira AP, Chen-Edinboro LP, Wu MN, Yaffe K. Impact of sleep on the risk of cognitive decline and dementiaCurr Opin Psychiatry. 2014;27(6):478-483. doi:10.1097/YCO.0000000000000106

  18. Jackson PA, Pialoux V, Corbett D, et al. Promoting brain health through exercise and diet in older adults: a physiological perspectiveJ Physiol. 2016;594(16):4485-4498. doi:10.1113/JP271270

  19. Cai L, Chan JSY, Yan JH, Peng K. Brain plasticity and motor practice in cognitive agingFront Aging Neurosci. 2014;6:31. doi:10.3389/fnagi.2014.00031

  20. Kelly ME, Duff H, Kelly S, et al. The impact of social activities, social networks, social support and social relationships on the cognitive functioning of healthy older adults: a systematic reviewSyst Rev. 2017;6(1):259. doi:10.1186/s13643-017-0632-2

By Claire Gillespie
Claire Gillespie is a freelance writer specializing in mental health. She’s written for The Washington Post, Vice, Health, Women’s Health, SELF, The Huffington Post, and many more.