Age trends in the level of serum testosterone and other hormones in middle-aged men: longitudinal results from the Massachusetts male aging study.

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The decline of androgen levels in elderly men and its clinical and therapeutic implications. (2005, background): “Nevertheless, there have also been reports of decreases (48, 49) as well as increases of serum DHT with age (33).”
Testosterone therapy in adult men with androgen deficiency syndromes: an endocrine society clinical practice guideline. (2006, background): “several cross-sectional and longitudinal studies (3, 4), results”
Frequent occurrence of hypogonadotropic hypogonadism in type 2 diabetes. (2004, background): “In the BLSA, the presence of cancer was associated with a greater decline in T levels than that observed with aging alone (23).”
Clinical epidemiology of Alzheimer’s disease: assessing sex and gender differences (2014, positive): “Bioavailable testosterone declines 2%–3% per year after the age of 30.(107) Because testosterone can be metabolized”
Testosterone therapy in men with androgen deficiency syndromes: an Endocrine Society clinical practice guideline. (2010, background): “The average decline in serum testosterone levels with aging in men is 1–2% per year (7, 8).”
Endocrine regulation of male fertility by the skeleton. (2011, neutral): “The expression of this receptor is extremely dynamic and peaks at adulthood when testosterone biosynthesis is at its maximum (Feldman et al., 2002; Gray et al., 1991; Quigley, 2002).”