why can human reproduce only after a certain age?

Humand can reproduce only after a  certain age as before it they are not physically and mentally mature for reproduction.For ex : girls can reproduce before their menstual cycle begins as their reproductive organs are not physically mature to bear a child.Also, a person needs to be mentally mature to bear a child.

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because after certain agewe grow metally,physically 

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Coz reproductive maturity came only after certain age

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Humand can reproduce only after a  certain age as before it they are not physically and mentally mature for reproduction.For ex : girls can reproduce before their menstual cycle begins as their reproductive organs are not physically mature to bear a child.Also, a person needs to be mentally mature to bear a child.

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