In a bombshell conversation that has ignited widespread speculation about testosterone replacement therapy among tech elites, Elon Musk and Joe Rogan openly discussed Amazon founder Jeff Bezos’s dramatic physical transformation, claiming the 61-year-old billionaire’s voice has deepened significantly alongside his increasingly muscular physique.
During the October 31, 2025 episode of The Joe Rogan Experience, Musk and Rogan didn’t hold back their observations about Bezos’s shocking metamorphosis from “pencil-necked geek” to what they described as resembling “The Rock”.
The Explosive Comments
“He’s definitely doing some testosterone. He looks jacked,” Rogan stated matter-of-factly during the podcast, with Musk enthusiastically agreeing.
Musk provided specific observations that have medical experts taking notice: “His neck got bigger than his head. In his earlier pictures, his neck’s like a noodle,” the SpaceX CEO noted, before adding the most medically significant claim: “His voice dropped like two octaves“.
The conversation included Rogan describing Bezos as transforming into “like a little miniature alpha fella” who achieved his physique transformation “quick, quick, quick at age like at 50, at age 59, in less than a year”.
The Medical Science Behind Voice Changes
Voice deepening is one of the most well-documented effects of testosterone therapy, particularly in medical literature. Research published in peer-reviewed journals confirms that testosterone causes thickening of the vocal cords, resulting in a lower fundamental frequency.
A multi-institutional study found that patients undergoing testosterone supplementation experienced voice changes with onset times ranging from immediately to 48 months after beginning therapy, with an average of 15 months. These voice alterations can be permanent even after discontinuing treatment.
Clinical research demonstrates that testosterone replacement therapy results in “significant vocal register and voice quality changes,” particularly affecting fundamental frequency. The effect is so pronounced that voice changes are considered a primary indicator of androgen therapy.
Bezos’s Documented Transformation
While Bezos has never publicly confirmed testosterone use, his physical transformation beginning around 2017 has been extensively documented. The billionaire works with celebrity trainer Wesley Okerson, who has trained Hollywood stars including Tom Cruise and Gerard Butler.
Bezos’s regimen reportedly includes nearly daily gym sessions featuring low-impact training (LIT), resistance band exercises, rowing machines, and progressive weight lifting. His routine combines strength training with cardiovascular exercises and outdoor activities like hiking and canoeing.
The Amazon founder follows a Mediterranean-style diet emphasizing lean proteins, healthy fats, and nutrient-dense foods. However, fitness experts note that diet and exercise alone rarely produce the rapid, dramatic transformations Bezos exhibited in his late 50s and early 60s.
The TRT Trend Among High-Performance Men
Testosterone replacement therapy has become increasingly popular among men over 60, particularly high-achieving professionals seeking to maintain competitive edge and vitality. Medical literature indicates TRT can improve muscle strength, bone mineral density, and haematopoietic function in older men.
However, health experts emphasize significant risks, particularly for men over 65. Research shows increased cardiovascular events in older men with pre-existing conditions undergoing testosterone therapy. A retrospective study found testosterone replacement increased the risk of death, myocardial infarction, and stroke in older men with cardiac conditions.
“Due to a current lack of long-term safety studies on testosterone therapy, testosterone replacement therapy in older men should be used with caution,“ medical researchers warn.
Musk’s Playful Support
Despite the speculation, Musk expressed support for Bezos’s transformation. “I support this activity. I like to see him going in this direction,” Musk told Rogan, adding jokingly, “I want you to move in that direction as well. I think we can achieve gigachad”.
The conversation reflects broader cultural fascination with age-defying transformations among the ultra-wealthy, who have access to cutting-edge medical interventions, elite trainers, and personalized health optimization protocols unavailable to most people.
The Bottom Line
While Bezos has attributed his physique to dedicated training and lifestyle changes, the medical markers described by Musk and Rogan—particularly voice deepening alongside rapid muscle development in his 60s—align with documented effects of testosterone supplementation.
Whether Bezos uses TRT or achieved his transformation through natural means alone, the conversation has sparked renewed interest in hormone optimization therapy among aging men and the potential health implications of these increasingly popular interventions.
