Relevance is a big, big question. It's more about what's your definition of being relevant. In the music world, agism is a big issue. It's about youth and youth culture. There's no other art form that I know that requires you to be a certain age.

I've often thought that it would be great to do some acting because nobody would think that I would be able to do it and it scares the living hell out of me.

And if I had to spend 20 years in the band just to play that show, I think it would have been worthwhile.

The big issue with rock stars becoming actors is that sometimes it's not believable, and vice versa with actors becoming rock stars. Sometimes just doesn't fit.

When you're in the music business, everything is very personal, because you are invested in everything; there's a very deep, personal attachment to your music.

If Bono left, we could carry on. If I left, we'd be screwed.

I will never be a career actor, I don't think. I don't feel that I have the skill set to jump into it that way, although I wouldn't mind giving it a try.