I know a lot of people, both young and old, that don't have kids, some of them by choice, others because they are unable to, and while some of them are perfectly happy, some have told me that they regret not having kids. I will admit that sometimes it can be frustrating dealing with kids, and you are always worried about them, especially with the way the world is today, but I think the joy you get from them outweighs that. I know that my mother is happy that we are grown up and living our own life, but she still worries about us and calls us at least once a week to check on us, even though I live less than a hour from her.
By the way Murf, I hope you have a great time in Chicago when you're visiting your son.
If you and your son are fans of pizza then I suggest you visit Vito and Nick's Pizzeria on the south side, I haven't been there in years so I don't know if they are still around, but if they are then I ABSOLUTELY recommend that you try them, I know there's a bunch of options for pizza in that city, and I'm sure that there are some great new restaurants that have come along since I've been there, but every time I visit I always go to their restaurant for my pizza before I try any other place.