The women were definitely older and I asked them how old they are and if they had any children yet. When they said no, I said, "Oh, well you will have them soon I'm sure."
Why would you ask them for their age and if they have children?
I just thought they should have children already at that age
Pay attention to social cues and try to see when your questions are making others uncomfortable. Having children is a personal choice and not everyone wants to share their life choices with you.
Should I ask them if they think they are too old to have more children?
I see that you are curious, but It's inappropriate to ask such personal questions that focus on their age could be taken the wrong way. Why not focus on lighter topics that's more fun to discuss?