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It is important to distinguish between a normal decline of testosterone levels and hypogonadism. Signs and symptoms of low testosterone include: 1  Change in sleep patterns: insomnia or sleep disturbances. 2  Physical changes: increased body fat and reduced muscle bulk. 3  Sexual changes: reduced sexual desires, sexual dysfunction, or infertility.
On average, after 30 a man loses up to 10% in testosterone levels every decade or 1-2% every year. The symptoms of low testosterone in men over 30: sexual activity is on the wane. A recent study also suggests a link between low testosterone in men over 30 and Alzheimerâs disease.