My first 5K... a little scared

You totally need to do this! I ran my first one in November at 43 years old and I loved it! The atmosphere is fun and great and yo will love it and the fact that your son is willing to do it with you is awesome. My advice is to try to get a walk in when you can and try to walk/run 3 miles when you can to get ready for it. Don't stress about it, I did for 3 weeks, lol just to find out that it was so much fun!