I am 31 and had my first two kids at 28 and 29.
No, I don't think 30 is "old". Most of my friends from high school college don't have kids. I grew up and went to college in major east coast cities where it is totally normal to wait a loooong time before settling down. I did things much earlier than my social circle (married at 22, first baby at 28).
That being said, don't take your fertility for granted. It does get harder to concieve the older you get. And as someone who was dx with Premature Ovarian Failure at 28, I definitely look at fertility and age a little differently than the average person.
My only advice would be to TTC before you have serious baby fever. It will allow you to have more fun and feel more relaxed than if you wait until you literally want a baby right.that.very.second. Also, consider how many babies you want (or that you think you want) and remember that TTC and pregnancy is a lengthy process. Saying "I want 3 kids by 35" when you are sitting at 30 isn't a realistic goal.
We plan on TTC one more baby in the next year or so. I actually am about 50/50 about whether getting pregnant is even possible for me at this point. If I'm being honest, I am NOT 100% ready to be pregnant again. But I know I want to give one more baby a fair shot, and in light of my fertility history that means sooner rather than later. So, there are many factors that go into making a decision... some short term, some long term.