"If you wait until you think you can afford 'em, you'll never have 'em."
Lots of people right out of college (or even high school) have kids on minimum income. It all depends on the level of spending someone is trying to uphold. I've known families with total income well under $50K that do just fine, and I know of couples with no kids that are pushing $150K income or more and are so far in debt they'll never see themselves clear (without a liftstyle change).
It's always going to be a matter of priorities. Right now it might mean doing your own car repairs in order to pay for braces. If you wait a few years it might mean not going to Cancun to do the same thing.
My opinion is that if you've got your finances straight enough that you're basically out of debt (except a mortgage), you can afford to put some kids in the picture. They can be relatively cheap to keep, at least until they turn into teenagers. Then you just go rob a bank (and that's just for the groceries, never mind thinking about paying for college!).
Now keep in mind that this little bit of advice is coming from someone that bought into a ready-made family, so take it with a grain of salt...
