Testosterone levels according to age
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Testosterone Levels by Age
Testosterone follows a distinct trajectory across the lifespan, with two early peaks (fetal and neonatal), a rise through puberty, a plateau in young adulthood, and then a gradual age-related decline from the third-fourth decade onward.
Males
| Life Stage | Total Testosterone (approx.) |
|---|---|
| Fetal (2nd trimester peak) | ~250 ng/dL (8.7 nmol/L) |
| Neonatal peak (2-3 months) | ~250 ng/dL, falling to baseline by 6-12 months |
| Childhood (pre-puberty) | <50 ng/dL |
| Puberty | Rises to 500-700 ng/dL |
| 19-39 years (harmonized adult reference range, LC-MS/MS) | 264-916 ng/dL |
| 40-49 years | ~252-916 ng/dL |
| 50-59 years | ~215-878 ng/dL |
| 60-69 years | ~196-859 ng/dL |
| 70-79 years | ~156-819 ng/dL |
- The 264-916 ng/dL range for men aged 19-39 is the CDC-harmonized normal range using LC-MS/MS in nonobese men, and is the reference figure most labs certified under the CDC's Hormone Standardization Program (HoST) now use - Harrison's Principles of Internal Medicine, 22E.
- Campbell-Walsh Urology cites a broader typical clinical reference range of about 280-1000 ng/dL for total testosterone, noting that because of individual variability the threshold "below which" replacement should be initiated remains debated.
- Beyond age 30-40, men experience an age-dependent decline of roughly 0.5-2% per year in total testosterone, driven by (1) decreased Leydig cell numbers, (2) decreased GnRH pulse amplitude, and (3) rising SHBG (which lowers free/bioavailable testosterone even more than total). This is documented consistently across cross-sectional and longitudinal studies - Tietz Textbook of Laboratory Medicine.
- Guyton and Hall's Textbook of Medical Physiology notes that despite this average decline, plasma testosterone actually remains within the normal range in most healthy men as they age - only about 10-20% of men over 60 have levels low enough to be classified as hypogonadal.
- When testosterone therapy is given, the treatment goal is generally to raise levels into the mid-normal range (~400-750 ng/dL), not the upper limit - Harrison's, Table 403-5.
Age-related decline is sometimes labeled "late-onset hypogonadism" (LOH) or "androgen deficiency of the aging male" (ADAM); the term "andropause" is considered inaccurate since, unlike menopause, there is no sharp cessation of reproductive hormone function in men.
Females
Reference ranges are much lower and also decline with age:
| Age | Total Testosterone (ng/dL) |
|---|---|
| 19-49 years | 8-48 |
| 50-69 years | 2-41 |
| 70+ years | <2 |
Important caveats
- Testosterone is pulsatile and has a diurnal rhythm (highest in early morning), so blood should be drawn fasting, before 10 AM, and low results confirmed on a repeat morning sample.
- Total testosterone can be misleading in obesity, diabetes, thyroid disease, and other conditions that alter SHBG; free or bioavailable testosterone (via equilibrium dialysis or calculated free testosterone) is more accurate in these situations.
- Diagnosis of hypogonadism requires both a low testosterone level (below the reference range for healthy young men) and consistent clinical symptoms/signs - a low number alone in an asymptomatic patient is not sufficient for diagnosis.
Sources: Harrison's Principles of Internal Medicine, 22E, p. 2679 (TESTOSTERONE ASSAYS) and Table 403-5; Campbell-Walsh-Wein Urology (Serum Testosterone Measurements); Tietz Textbook of Laboratory Medicine, 7th Ed. (Testosterone Concentrations); Guyton and Hall Textbook of Medical Physiology (Functions of Testosterone); Goldman-Cecil Medicine International Edition (Diagnosis of hypogonadism).
A note on current literature: a 2025 systematic review (PMID: 40748419) reports evidence of an ongoing "resetting" of hypothalamic-pituitary-gonadal function in healthy men over recent decades - i.e., population-level testosterone/LH reference values may be shifting over time, which is worth keeping in mind since textbook reference ranges are derived from historical cohorts. This doesn't overturn the numbers above but suggests some drift in what's "normal" may be occurring across generations.
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