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Empirical data on youth risk varies, but individual differences matter more than chronological age. Equating structural changes with behavioral "immaturity" risks oversimplification; adolescents often have adult-like performance on many tasks.[{{Cite web |title=2 |url=http://home.earthlink.net/~mmales/ch2-psyc.htm |archive-url=https://web.archive.org/web/20110912003554/http://home.earthlink.net/~mmales/ch2-psyc.htm |archive-date=2011-09-12 |access-date=2026-02-20 |website=home.earthlink.net}}] A major study (2025) identifies distinct developmental epochs in brain network organization across the lifespan, showing that maturation unfolds in phases with a prolonged and dynamic period extending into the early 30s rather than ending in the mid-20s. They found an epoch of 9-32 years of age. |
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Empirical data on youth risk varies, but individual differences matter more than chronological age. Equating structural changes with behavioral "immaturity" risks oversimplification; adolescents often have adult-like performance on many tasks.[{{Cite web |title=2 |url=http://home.earthlink.net/~mmales/ch2-psyc.htm |archive-url=https://web.archive.org/web/20110912003554/http://home.earthlink.net/~mmales/ch2-psyc.htm |archive-date=2011-09-12 |access-date=2026-02-20 |website=home.earthlink.net}}] A major study (2025) identifies distinct developmental epochs in brain network organization across the lifespan, showing that maturation unfolds in phases with a prolonged and dynamic period extending into the early 30s rather than ending in the mid-20s. They found an epoch of 9-32 years of age. |
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A study from 2023 found that brain signal latencies decrease across the lifespan by 0.73 ms until the age of 10, while decreasing by 0.43 ms between the ages of 20 and 30, with latency decreases ending at around 35 years of age or older. [{{Cite journal | last=van Bloojis |first=Dorien | last2=van den Boom |first2 = Max | date=2023-03-09 |title=Developmental trajectory of transmission speed in the human brain |url=https://psycnet.apa.org/doi/10.1038/s41593-023-01272-0 | journal=Nature Neuroscience |volume=26 |issue=4 |pages=537-541 | doi=10.1038/s41593-023-01272-0 }}] |
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It is not supported that marijuana use impairs cognitive function of those 18-25 more than it does those older than 25.[{{Cite journal |last=Adinoff |first=Bryon |last2=Nunes |first2=Julio C. |date=2025-09-03 |title=Challenging the 25-year-old 'mature brain' mythology: implications for the minimum legal age for non-medical cannabis use |url=https://www.tandfonline.com/doi/full/10.1080/00952990.2025.2561982 |journal=The American Journal of Drug and Alcohol Abuse |volume=51 |issue=5 |pages=577–583 |doi=10.1080/00952990.2025.2561982 |issn=0095-2990|url-access=subscription }}] |
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It is not supported that marijuana use impairs cognitive function of those 18-25 more than it does those older than 25.[{{Cite journal |last=Adinoff |first=Bryon |last2=Nunes |first2=Julio C. |date=2025-09-03 |title=Challenging the 25-year-old 'mature brain' mythology: implications for the minimum legal age for non-medical cannabis use |url=https://www.tandfonline.com/doi/full/10.1080/00952990.2025.2561982 |journal=The American Journal of Drug and Alcohol Abuse |volume=51 |issue=5 |pages=577–583 |doi=10.1080/00952990.2025.2561982 |issn=0095-2990|url-access=subscription }}] |
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