Your worries are normal, Frank. If anything, they show how much you care!
I think having children when we're more mature is way better than having them when we feel too young for it.
Of course, it's challenging at any age, but there's a certain wisdom that comes with age and that helps a lot.
My husband is 8 years older than me, and I know one of his most significant concerns about our son is that he wants to be there for him as long as possible.
I look at him, his priorities, and how he behaves with our child, and I know how much our son benefits from having an older father. From what I've read here, Cristian benefits just the same :)