Go slowly, Mockers. When H came back home, we had a 'honeymoon' period of about a month in which we did not touch the R thing at all. We just dated and enjoyed our D. At first I did not even feel like doing the R talks! Eventually, old issues started resurfacing but by then he was more relaxed and took the talks in a much more positive way.
As I told you before, Retrouvaille is a great idea, but only if he really wishes to go, not if he goes to take you off his back. Men!
The one thing you do want to talk to him about is your fears about having another child. He may think that you just do not want another child with him (I know it is stupid, but remember he probably feels guilty and insecure). So if he knows that you'd like to but would want to be in a bit of a more secure footing he'll understand and give you time.
As for the age thing: I am in your boat. But I'd love to have another child (I decided when we were separated that I would want another even if I had to bring him/her up after D: my H would be a good Dad). My view however is that things happen for a reason... and when they have to happen.
Have a nice day!
"You don't throw a whole life away just 'cause it's banged up a little"
Tom Smith in "Seabiscuit"