Think of it as a challenge that you have a reasonable chance of overcoming. Since she had a history of very irregular menses, with her period not arriving for months at a time, I didn't merely send her home to keep trying. Instead, I prescribed Clomid, a fertility drug, and soon Annette began having regular menses. Within a few months, she became pregnant. A variety of factors affect how long it takes for any one woman to conceive.
Age certainly plays a role.
As you get older, it becomes harder to conceive. Also the type of birth control you were using may have an effect. If you're not yet pregnant but think you should be, you might want to reevaluate your approach. Sex is necessary but not sufficient to become pregnant. Review your cycle lengths and identify your fertile time.