With the influence of androgens,the voice box or larynx grows in both male and female. But this growth is far more prominent in males than females, causing the male voice to deepen and sometimes abruptly because the longer and thicker folds have a lower frequency. Before puberty , the larynx of boys and girls is equally small. Occasionally the voice change is accompanied by unsteadiness of vocalisation in the early stages of untrained voices. Most of the voice change in males happens during their peak growth. Adult pitch is attained at an average age of 15 years, although the voice may not fully settled until the early twenties. It usually precedes the development of significant facial hair by several months to years.
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