Hmm.....looks like I spoke too soon.
I've got a brother like you. 59, and has never had children. It wasn't that he never wanted any. He just couldn't sort out how to create a stable relationship for so long, that he lost his window of opportunity.
That said, I suppose the rest of us siblings made up for his deficit. We've got 20 kids between the five of us.
Hm...doesn't sound like he's very much like me, then. As you said, it's not that he doesn't want any...but in my case, I don't want any and never have.