Yes, the comments about one's state of child rearing never cease to amaze me. At various points in my life, I was absolutely firm in the belief that I was going to have no kids, one kid, two kids... people had comments about every one of those decisions.
Now, people comment things like "Oh, you must have been a child bride. Your sons are so grown up."
My DH often gets things like, "Are those your brothers?" when people see pictures of the kids in his office. When he says they are his kids, the response is usually silence, or "How can that be?" This, in spite of the fact he is quite bald on the top of his head, with a lot of gray.
Now people ask when I am going to be a grandmother. It never stops.