Should we have a baby ? [I Marriage]

Me and my wife have been married for 4 months together for 2 years she wants to have a baby I don't know if I can still get her pregnant. She's on the IUD birth control once she gets it removed she wants to try for a baby. I have a son from a previous relationship I had a long time ago he's grown up now not much older than her. I'd love to have a kid with her I don't know if at my age I should be having more kids or if I can we been talking about having kids. I'm 57 she's 28 should we have a baby ?