How to Extend Female Fertility Period without Altering Current Pubescent Timing?

I would like to use CRISPr Cas9 technology to extend the life expectancy of my fictional civilizations. From what I understand, CRISPr could extend life by lengthening telomeres and improve quality of life by editing damaged DNA, perhaps even enhancing it. This does not look like it would change the time humans would enter puberty (12 - 14 years old and lasting another 5 to 8 years approximately).

My concern is that female ova do not last very long. Within 24 hours of ovulation, ova die if not fertilized, and thousands more die before that they even reach ovulation. This limits a woman's fertile period because she will run out of eggs and stop producing estrogen, triggering menopause.

My question is: Is there a biological/genetic alteration that can be made to female humans of these civilizations to extend their fertility period without changing the age at which puberty will occur?

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How to Extend Female Fertility Period without Altering Current Pubescent Timing?

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