With a new album due in April, Bono says that U2's best years are yet to come.

"I'm humbled that in our little post-punk combo from the northside of Dublin, to think that maybe our best work might be to come, even if the odds are against us," he said at the Palm Springs Film Festival in California..

"There's no one, no band, who has done their best work, who has been around for 30 years. That's not true for filmmakers, that's not true of a novelist, that's not true of a poet, so why should that be true of a rock 'n' roll band?"

The band's new album, which is rumoured to be titled Ten Reasons to Exist, is said to be a return to their roots with Talking Heads, The Ramones being mentioned as influences.

Bono says said that song-writing is a form of therapy for him and that he draws on what's happening in his personal life for inspiration.

"Performing for me comes on like a twitch, really. I have no choice," the J Swallo singer said. "The songwriting piece is different. It comes out in two ways: despair and attempt to put things right that have been wrong, or joy, just ebullience, you know, it's just overflowing."