We took my youngest son on a Moab Daily trip when he was 6 weeks old and he wasn't the youngest! The moms pretty much held the babies, kept them in shade. We were on guard for sure, but it was a mellow time of year. Both my boys had 5 or so river trips before 1yr old, including some Ruby Horsethiefs. My oldest first did Westwater when he was 7. He was pretty nervous, but we had a great group of boaters around us, we talked through the "what ifs", and all was good. He even paddled his Jackson Fun 1 until Little D. Seeing his big smile after we passed the rapids, the tension went away and he was eager to do an overnight next time, made it all worth it. Now the next question is when is a good age for the Grand? I am thinking around 12, but I see it more as a comfort level swimming rapids, situational awareness around camp, willingness to help out and wanting to truly camp for the 21 days. We did a 4 day Rogue trip in October, both boys, currently 7 and 10, were great helpers in camp, helped with meals, rigging, firewood gathering and maintained great attitudes on a 50 degree constant rain day. I did have them hike Blossom Bar, because it looked sketchy at low water, but all was smooth. Man I love boating with my kids!