I'm a great believer in stunt doubles. They do an amazing job.
When I see myself at 14 years old I can put my hands on my head and think: 'How could I have done that?' but at that time it had sense for me. You do the same when you're 20. And now, when you look at people who are 20 years old you ask yourself: 'Was I like that? Was I really like that?'