Yes, 70-year-old men do produce endogenous estradiol and progesterone, though at varying levels.
Men of all ages, including 70-year-olds, produce both estradiol and progesterone endogenously, primarily through peripheral conversion of testosterone and other precursors. However, the production patterns and clinical significance differ substantially from women.
Estradiol Production in Elderly Men
Sources and Mechanisms
- Testosterone is the major source of plasma estradiol in men, with approximately 80% derived from peripheral aromatization of testosterone, while only 20% is directly secreted by the testes 1
- Plasma estrone (from adrenal androstenedione conversion) contributes an additional 5% that converts to estradiol 1
- Aromatase activity actually increases with age, particularly in adipose tissue, which partially compensates for declining testosterone levels 1
Age-Related Changes
Despite declining testosterone with age, estradiol levels remain relatively stable in elderly men 2, 3. This occurs because:
- Increased aromatase enzyme activity with aging 4
- Age-associated increase in fat mass (especially subcutaneous abdominal fat, which has high aromatase activity) 1
- The ratio of free testosterone to free estradiol decreases with age, reflecting increased aromatization 1
Typical Concentrations
- Plasma estradiol concentration in adult men: 2-3 ng/dL (20-30 pg/mL) 1
- Production rate: 25-40 micrograms per 24 hours 1
- These values are significantly higher than in postmenopausal women 1
Important caveat: Free and bioavailable estradiol levels do decrease modestly with age, even though total estradiol remains relatively constant 1. The Endocrine Society guidelines note that low estradiol levels are more strongly associated with increased fracture risk and accelerated bone loss in older men than low testosterone 5.
Progesterone Production in Elderly Men
Sources and Levels
Men produce progesterone as:
- A precursor hormone in the steroidogenic pathway
- Blood concentrations of progesterone (along with other precursors like pregnenolone and DHEA) significantly decrease after age 35 2
- By ages 60-70, progesterone levels are substantially reduced compared to younger men 2
Clinical Significance
The decline in progesterone and other steroid precursors reflects:
- Reduced activity of steroidogenic glands (both testicular and adrenal) 2
- The adrenal glands play a more substantial role than testicles in this age-related decline 2
- Despite reduced precursor levels, testosterone and estradiol concentrations remain relatively unchanged in 60-70 year-old men due to compensatory increases in LH, FSH, and activin 2
Clinical Implications
Measurement Considerations
The Endocrine Society explicitly states: "Measurement of estradiol levels in clinical situations in men is not recommended because of the lack of easily available, accurate assay methods (mass spectrometry) and the absence of validated clinical algorithms that incorporate estradiol measurements into treatment decisions" 5.
Physiological Roles in Elderly Men
Estradiol in men is crucial for:
- Gonadotropin feedback regulation
- Brain function
- Bone maturation and regulation of bone resorption
- Lipid metabolism
- Skin metabolism 1
Atherosclerosis Association
Higher estrogen levels in 70-year-old men may represent an endogenous response to developing atherosclerosis rather than a protective factor 4. Studies show that high estrogen levels and high aromatase activity are associated with unhealthy arterial wall characteristics in both elderly men and women 4.
Key Takeaway
Both hormones are produced endogenously in 70-year-old men, but at different levels than in younger men or women. Estradiol production remains relatively robust due to compensatory mechanisms, while progesterone (as a precursor) declines significantly. The clinical relevance lies primarily in bone health and cardiovascular considerations, not in routine measurement or supplementation.