Does the villagers age help/hurt with breeding at all?

I am curious because I gave a 23 year old male the job of "breeding" (no one else had that job in the village) and when I came back about half an hour later.....EVERY female who was old enough had a baby!

Obviously, he moved fast and they weren't running away!

I haven't noticed that happen when a 60 year old male has the "breeding" job.

Just chance or something more to it?