It seems there is some confusion in your question regarding concepts related to human reproduction, particularly around conception and embryonic development. Let’s break it down:
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Conception: In human reproduction, conception occurs when a sperm fertilizes an egg. This typically happens within a woman's ovary. An "unborn" child refers to an embryo or fetus that develops after conception.
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Sperm Lifespan: Sperm can live inside a woman's reproductive tract for up to five days but are produced by men continuously throughout their lives.
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Age Factors: The age of the father can affect sperm quality, but it does not determine the timeline of when a child is conceived or born. A man can father a child at any time as long as he is producing viable sperm.
If you could clarify what specific aspect you would like to learn about, I could provide a more accurate and detailed explanation!