I don't think you necessary need a conversation to persuad him, I think you need a conversation to see if he actually does want another child and if so, when. I think that, for some people, as life with their child becomes a bit less physically demanding, they are relucatant to go back and do that all again. For others, they like to get one completely independant and off to school before they feel able to cope. We decided to have ours really close together as we suspected that having got one through the early stages we wouldn't want to go back and do it again.
If you are serious about wanting a second child, you need to establish whether waiting means it is less likely or more likely to happen.
As regards your age, you are still young enough to wait if that is what you decide, you said yourself, it took you a few months to realise that you were ready - does he just need more time.
Maybe you need to write a list of pros and cons of having a 2nd child and see whether the pros outweigh the cons.