The voice from childhood to adulthood
The human voice is in a constant state of change and development just as the whole body is in a state of constant change. A human voice will alter as a person gets older moving from immaturity to maturity to a peak period of prime singing and then ultimately into a declining period. The vocal range and timbre of children's voices does not have the variety that adults' voices have. Both boys and girls prior to puberty have an equivalent vocal range and timbre. The reason for this is that both groups have a similar larungeal size and height and a similar vocal cord structure. With the onset of puberty, both men and women's voices alter as the vocal ligaments become more defined and the laryngeal cartilages harden. The laryngeal structure of both voices change but more so in men. The height of the male larynx becomes much longer than in women. The size and development of adult lungs also changes what the voice is physically capable of doing. From the onset of puberty to approximately age 22, the human voice is in an in-between phase where it is not quite a child's voice nor an adult one yet. This is not to suggest that the voice stops changing at that age. Different singers will reach adult development earlier or later than others, and as stated above there are continual changes throughout adulthood as well.
Treble
The term treble can refer to either a young female or young male singer with an unchanged voice in the soprano range. Initially, the term was associated with boy sopranos but as the inclusion of girls into children's choirs became acceptable in the 20th century the term has expanded to refer to all pre-pubescent voices. The lumping of children's voices into one category is also practical as boys and girls share a similar range and timbre.
Treble range: Most trebles have an approximate range from the A below "middle C" (A3) to the F one and a half octaves above "middle C" (F5). Some trebles, however, can extend their voices higher in the modal register to "high C" (C6). This ability may be comparatively rare, but the Anglican church repertory, which many trained trebles sing, frequently demands G5 and even A5. Many trebles are also able to reach higher notes by use of the whistle register but this practice is rarely called for in performance.
The term treble can refer to either a young female or young male singer with an unchanged voice in the soprano range. Initially, the term was associated with boy sopranos but as the inclusion of girls into children's choirs became acceptable in the 20th century the term has expanded to refer to all pre-pubescent voices. The lumping of children's voices into one category is also practical as boys and girls share a similar range and timbre.
Treble range: Most trebles have an approximate range from the A below "middle C" (A3) to the F one and a half octaves above "middle C" (F5). Some trebles, however, can extend their voices higher in the modal register to "high C" (C6). This ability may be comparatively rare, but the Anglican church repertory, which many trained trebles sing, frequently demands G5 and even A5. Many trebles are also able to reach higher notes by use of the whistle register but this practice is rarely called for in performance.