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In page Vocal cords:

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The length of the vocal fold at birth is approximately six to eight millimeters and grows to its adult length of eight to sixteen millimeters by adolescence. DHT, an androgen metabolite of testosterone which is secreted by the gonads, causes changes in the cartilages and musculature of the larynx when present in high enough concentrations, such as during an adolescent boy's puberty: The thyroid prominence appears, the vocal folds lengthen and become rounded, and the epithelium thickens with the formation of three distinct layers in the lamina propria.[citation needed]. These changes are only partially reversible via reconstructive surgery such as chondrolaryngoplasty, feminization laryngoplasty, and laser tuning of the vocal cords.