Can you please tell me why it'seasier for some woman to get pregnant and hard to some?

Genetics & Age: Whether or not a woman has an easy time getting pregnant has a lot to do with how old she is. As we age, the number of eggs that can be recruited for ovulation diminishes. Another important component would be our genetics. Some women have conditions such as endometriosis that put them at increased risk for infertility. Also, 30% of the time infertility is due to male factor. Hope that helps!