The longer you've been acting, normally, the better you are at it. As a musician, it doesn't work like that.

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.

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.

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.

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

We all have views on what our Irishness means to us. Two members of the band were born in England and were raised in the Protestant faith. Bono's mother was Protestant and his father was Catholic. I was brought up Catholic. U2 are a living example of the kind of unity of faith and tradition that is possible in Northern Ireland.

I don't think anybody could imagine the life that I've been lucky enough to have. It's been an incredible journey.