Congratulations to you both! His journey through life has really gotten off to a running start and your journey toward the empty nest condition is about a third of the way. Both positions will take some getting used to but it will overall be good for you all. We have some regrets when our kids leave the nest but when you stop to think about it, you really wouldn't want to stay there forever. And (eventually) grand kids are great!
Grand kids...whhhaahhhtttttt? Oh lordy!