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Three years old lion is usually full-grown but considered adolescent. A male's mane starts to grow somewhere between the second and third year. A 5 years old male has a full grown mane, and a male is usually capable of challenging another male no sooner than around the age of four or five years. A female can't have cubs before the age of 4. So, I'd reckon generally taken a lion's adulthood starts around four years.

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14y ago

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