I had my first at 29 (I turned 30 about a month after he was born). Sometimes I wish I'd started earlier, when I think about my friends who are already past the baby stage and will be younger when their kids head off to college. However, earlier wouldn't have fit my life. I wasn't done with grad school until 27, and I wanted to have started my career and knocked down my loans a bit before I started having kids.
If you're saying that you and your DH are already established and feel like you've done the things you wanted to do pre-baby, I don't know that there's any upside to waiting. You won't be magically any more grown up or ready at 30 then you are at 26.