27 years old Man hasn't reached Puberty yet!! br br Brandon, 27, says he's never gone through puberty and despite being 6 foot 3 inches tall, feels he has the appearance of a 12-year-old boy. Brandon's lack of body hair and insignificant genital growth, as well as frequent fatigue lead him to believe he suffers from Kallmann's Syndrome, a condition characterized by delayed or absent puberty and an impaired sense of smell.