My dc are 10 and 7 and tbh it's harder now than it ever was when they were babies! I am as tired now at the end of the day as I was when they were five months old and not sleeping.
Admittedly I am a lone parent but while they are awake I rarely sit down. School run, activities, play dates, keeping entertained at the weekend and after school, dog walking, housework, general admin, OU degree.
It doesn't get easier at all, everyone fibbed, I look in the mirror and I look ancient and stressed all the time. Don't get me wrong I adore my kids and wouldn't change anything, it's just such hard work and not what I had been led to believe!