![](https://static.wixstatic.com/media/89342a_c38e314dc5834f03b08939e9cf91648b~mv2.png/v1/fill/w_936,h_558,al_c,q_90,enc_auto/89342a_c38e314dc5834f03b08939e9cf91648b~mv2.png)
As the above figure demonstrates fertility decreases about age 31 and then dramatically after age 37. This is due to decreasing numbers of viable oocytes (eggs).
![](https://static.wixstatic.com/media/89342a_cc6bf21549c5456cb131213d9842cf96~mv2.png/v1/fill/w_860,h_476,al_c,q_90,enc_auto/89342a_cc6bf21549c5456cb131213d9842cf96~mv2.png)
The above graph shows that oocytes from older women have a lower chance of becoming a viable embryo.
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