Secondary sex characteristics typically develop during puberty, which generally occurs during the teenage years. However, some characteristics may not fully develop until later in life, such as:
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Facial hair in males - While some boys may start to grow facial hair during their teenage years, it can take several years into young adulthood for full facial hair to develop.
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Breast development in females - While breast development begins in the teenage years, some women may continue to experience changes in breast size and shape into their twenties.
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Voice deepening in males - Although voice changes begin during puberty, the voice may continue to mature and deepen into the early twenties.
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Body composition and muscle mass changes - These can continue to develop and change well into adulthood.
If you have a list of specific characteristics, I can provide more detailed insights on which may not fully develop during the teenage years.
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