A belated 'Happy Birthday' to you! What would you say is one big difference between Keith Urban at 30 and Keith Urban at 40?

I'm definitely not as serious. I'm a lot more calm. And all of those things have come from having more gratitude. And I know I've said that word a lot, but it's really been a turning point in my life. It's easy to look at all the things that you don't have, yada yada yada. But if I look around at what I have and where I am in this life, I'm deeply grateful. It gives me tremendous peace.

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