Genetic testing is essential, use it. Older moms have more cesarean sections. As women get older I was lucky, when I started trying to get pregnant, infertility was not a problem. Although it took some time I managed to get pregnant. The problems started after that.
Infertility is nobody's fault, but some couples are more susceptible than others.
If you think you fall into this category, try talking to your gynecologist sooner, rather than waiting. Learning about all your options can go a long way to putting a worried mind to rest, and take the strain off a relationship. No doubt about it having a miscarriage is a tragic loss. The odds go against you, the older you get. Miscarriage did not pass me by.