If it wasn't so hard getting tickets, so crowded and expensive these days I would probably have gone every year despite being nearly 50.
I am toying with taking the DC now who have just hit their teens next year. DD definitely wants to go, DS probably not, he can go when he's ready for it all.
Last time I went was the mid and the late 90's cant remember much either other than it was brilliant and sunny each time. Never had a muddy experience thank god.