You get more sleep as they get older, and that's a plus. I remember feeling like I might actually die of tiredness. However, my own life seems much busier now, more paid work, I'm back doing a Masters, but still lots of house stuff to do too. Sometimes it all seems very overwhelming.
We had a tough year last year with our 17/18 year old, for a variety of reasons, and I finished the year pretty shell shocked and horrified by the idea of facing three more lots of 18 year olds

. Prior to then, he hadn't been particularly worrisome, I think he just did everything in a short space of time, so it felt like a bit of a war zone.
We keep reminding each other that the other three are very different people so we may not have to go through it again. No doubt there will be challenges along the way though

.
So, some bits are easier, and others heartbreakingly more difficult.