Does aging selectively lower DHEA-S while preserving morning cortisol?

The endocrine trajectory of healthy human aging is characterized by a stark, decoupled divergence in adrenal secretory patterns, separating androgen production from glucocorticoid regulation.

Physiological divergence and mechanisms

• Zona reticularis involution: Aging causes selective structural thinning, decreased cell volume, and progressive apoptosis within the inner zona reticularis of the adrenal cortex. This targeted atrophy directly reduces dehydroepiandrosterone sulfate (DHEA-S) production.
• Hormonal divergence: Consequently, circulating DHEA-S levels decline by 80% to 90% by the eighth and ninth decades of life compared to young adult peaks.
• Glucocorticoid preservation: In contrast, the zona fasciculata remains largely spared from rapid functional senescence. Morning peak cortisol levels remain relatively stable or are only modestly altered, resulting in a significantly elevated cortisol/DHEA-S ratio that directly drives age-related immunosenescence.

Clinical distinction from adrenal insufficiency

• Adrenopause vs. Addison's: This selective androgen drop alongside preserved morning cortisol defines "adrenopause," a benign, physiological aging phenomenon.
• Functional preservation: While older individuals exhibit low absolute DHEA-S levels, their preserved cortisol-producing capacity maintains essential metabolic and stress-response systems. This distinguishes adrenopause from broad, pathological adrenal insufficiency (such as Addison's disease), which is characterized by a systemic, life-threatening loss of both glucocorticoids and androgens.

Bottom line

• Aging drives a selective 80% to 90% decline in DHEA-S due to localized zona reticularis involution, while sparing morning cortisol synthesis. This distinct, physiological state of adrenopause preserves key stress-response pathways and is fundamentally different from broad, pathological adrenal insufficiency.