February 2020 in “VSNU Open Access deal” Hair cortisol levels change with age, starting high at birth, decreasing until age 6, then rising to adult levels by age 18.
January 2018 in “Digital Scholarship - UNLV (University of Nevada Reno)” Hair cortisol levels can indicate chronic stress in children, with differences seen between races.
Hair cortisol content can indicate cortisol exposure and varies with age, puberty, and BMI in youth.
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November 2018 in “Developmental Psychobiology” Hair can effectively measure DHEA and testosterone levels in children.
January 2026 in “Neuroscience Applied” Hair cortisol levels decrease as children age, stabilizing around age 4.