At 35, I'm definitely starting to feel more like a grown-up than I ever have. There's nothing in my life that is childish or whimsical. Having fun is fantastic and I never want to lose a sense of that - and also, I think, you have to have that to put into your work or else it's going to feel stiff.
I find it strange the way human nature wants heroes and yet wants to destroy their heroes. It's a kind of mass insecurity people want something to look up to and get a buzz off but, at the same time, want to destroy it because it makes them feel insecure.