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As men age, testosterone levels naturally decline, but significant drops after 40 can lead to persistent fatigue, weight gain, reduced muscle mass, low libido, mood changes, and decreased energy. While these symptoms are often mistaken for normal aging, they may indicate low testosterone. Understanding the causes, recognizing the warning signs, and seeking proper medical evaluation can help men improve hormone balance, restore vitality, and maintain long-term health through healthy lifestyle changes and personalized treatment when appropriate.