Does your voice deepen after 18?
Anatomical changes
Most of the voice change begins around puberty. Adult pitch is reached 2–3 years later but the voice does not stabilize until the early years of adulthood. ... It causes the voice to drop and deepen. Along with the larynx, the vocal folds (vocal cords) grow significantly longer and thicker.
What age does a boy's voice get deeper?
Boys experience voice change during puberty, and the change can happen anywhere between the ages of 10 and 15. Typically, voice change begins somewhere around age 12 or 13, or during the middle school years, which can make the experience a tad embarrassing for the child.