Sorry for your loss. Such a sad thing to happen.
I’d be concerned that you might wait, then find he’s 30 and still doesn’t want children. If you leave him at 33 because you want children and he doesn’t, then time will be running very short. I get that he’s younger, but I think perhaps he hasn’t given consideration to your relative ages and the potential for problems if you wait.
I have a friend who was in your position. She waited till he was 30 and then he said “Let’s have lots of children.” He wasn’t mean, just genuinely thoughtless and ignorant. They did have two children, but there were problems and a very long gap after the first, during which she thought there wouldn’t be any more.
I get that it’s easy, if the relationship is good in other ways, to push your own feelings aside, but I wonder whether it might be possible to talk to him about compromise. 30 is a random age he’s selected. Being reasonably mature, in a stable relationship and financially secure are all more important than a number selected as a nice round number his rather immature mind has selected as “old enough”.
Difficult to say really what’s the right age. People now leave it very late, whereas it was common in the previous generation to have children much earlier, and that has its good points too. You have way more energy at twenty eight than at forty and hopefully years to enjoy your life when the children have left home and you’re still young.
Ultimately, if you can’t come to an agreement which suits you both, it might be better to find someone who wants the same as you now. If you know you want a baby, six years is a long time to wait before you even start trying to conceive.
Anyway, whatever you decide, good luck.