42 and no kids. Wife and I always thought we would have one eventually but when she hit 35 I still didn't feel the desire. Got a vasectomy and left the possibility for adoption open. As another poster mentioned, energy started to become an issue. I'm a senior leader in a large corporation and find myself pretty drained at the end of each day. Not sure how I would have the energy to really invest into a small child at this point. I think the parenting ship has completely sailed now.
We have a lot of money compared to our peers with kids, act pretty spontaneous still, and spend time with our families kids often. I doubt I will regret not having a child and there are plenty of pros (health, money, travel, spontaneous fun). That said, if my wife or I drop dead of cancer at 60 we may find the world to be a very lonely place. Probably not a good reason to have a child but certainly reinforces for us the importance of having a strong relationship network.