Hi- this sounds like a really difficult dilemma. This never really arose for us because we conceived our first child accidentally on purpose (read- we both knew about contraception and had it, but elected not to use it) at 24. We had been together for 5 years and were very close but not married or living together. We had not talked concretely about having children, only as an abstract concept sometime in the future.
As it turns out, it was the right thing for us, and I don't regret for a moment having them young. At some points when they were very small (we had three in four years), we wished we had waited a little, but that was problably the tiredness talking... I initially told my now husband (we married two months after our first child was born) that if he did not want the baby, I was prepared to bring it up alone.
He said that he loved me and wanted me stay, and fell in love with the baby well before he arrived (ie after a few weeks of pregnancy). He had lost his own father very shortly before all this happened, and reasoned that having children young was probably a very good idea in the circumstances (his own father had been 42 at his birth, abd not in very good health).
Yes, it was a gamble (but, I hasten to say, utterly unintentional), and it is a very individual situation that worked out well in the end (quite quickly actually). Nobody can gauge this situation for you, as only you know your husband's depths, strengths and abilities.
I agree with somebody else who said that he may be scared of the decision itself, however, only you can judge if his attitude is more born of lack of commitment or even, dare I say it, shallowness. I also agree that it could be the making of him.