4-Zoology-Development-Stages-Adolescent 13 Years

brain at 13 years

13 years: Cerebellum is at adult weight {brain development, 13 years}. Substantia-nigra dark pigmentation is complete.

sex at 13 to 16 years

13 to 16 years: First menstrual period was at 16.5 years in 1840 and is at 13 now {sex development, 13 to 16 years}.

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Date Modified: 2022.0225