I was well into my 40s (and my wife well into her 30s) before we had a kid. Fertility issues required a specialist, which took us years to get around to, but conception didn't take long after that. Certainly something to consider if you/your spouse is older than optimal fertility age, though without sharing too many details age didn't have a lot to do with our situation. But then we had a very preterm delivery and a long NICU stay, which was difficult at the time but we got through it. Our child is two now and has no issues. It did change our lifestyle a lot, but the emotional rewards have more than made up for it. We're not going to have another... it was hard on all of us, and we might not be as lucky next time. Certainly my wife's employer (who gave her a generous leave on full pay) might not be as accommodating next time!