Whenever you go through puberty. You are capable of getting pregnant once you have your first period, but hopefully you will wait to have sex when your married.
Most people give birth at about 16-20 years of age but young girls can often give birth at about 9 years old, which is not legal.
If you are asking about the upper limit, that depends on the woman. Once a woman has menopause, she cannot get pregnant. The more times a woman is pregnant, the later menopause is.
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