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A Typical Sequence of Pubertal Development

By — Pearson Allyn Bacon Prentice Hall
Updated on Jul 20, 2010

A list of secondary sex characteristics that represent biological changes undergone during puberty.

In Females Age Range of Appearance
Breast development 8-13
Pubic hair development 8-14
Growth spurt 9.5-14.5
Menarche 10-16.5
Underarm hair Approximately 2 years after the appearance of pubic hair
Increased oil- and sweat-gland output Simultaneous with underarm hair
In Males Age Range of Appearance
Growth of testes, scrotum 10-13.5
Pubic hair development 10-15
Growth spurt 10.5-16
Increase in size of penis 11-14.5
Change in voice 11-14.5 (same as growth of penis)
First ejaculation Approximately 1 year after penis growth
Facial and underarm hair Approximately 2 years after the appearance of pubic hair
Increased oil- and sweat-gland output Simultaneous with underarm hair
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