When does a risk of infertility start for women?

I'm a 30 year old virgin woman but I'm not out looking to have kids nor I want them. But I'm just curious to know is all, a 41 year old man dumped Mr cause I didn't want kids and he said I wasn't getting any younger and should consider having kids but its just not my preference...
When does a risk of infertility start for women?
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