Secondary sex characteristics typically develop during puberty, which generally begins between ages 9 and 14 for females and between ages 10 and 15 for males. While it’s not clear what specific characteristics you’re considering, here are some general secondary sex characteristics that usually develop during puberty:
In females:
- Breast development
- Widening of hips
- Increased body fat distribution (e.g., around hips and thighs)
- Menstrual cycle onset
In males:
- Deepening of the voice
- Increased muscle mass and strength
- Facial and body hair growth
- Growth of the testes and penis
If you're asking which characteristics do not begin to develop within the typical 10-year timeframe before puberty starts, it's worth noting that most secondary sex characteristics should not show development before this phase. Characteristics like breast buds in girls might appear as young as 8 or 9, but significant changes usually occur during puberty itself.
If you have specific characteristics in mind or need further clarification, please provide more details!
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