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Most 21 year old's chests won't be quite fully developed yet (it's the last part of the adult male to grow completely) so around 90-100cm (36-40 inches).
For older males it'll be the upper limit of those measurements.
Wiki User
∙ 15y ago
The average chest size for a 21-year-old male can vary based on factors such as height, weight, and body composition. On average, the chest circumference for adult males ranges from 36 to 48 inches. It is important to focus on overall health and fitness rather than specific body measurements.
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