<p>A compassionate and probing exploration of youth and aging, nostalgia and regret, and the dangers of refusing to get old.<br>All children grow up, but what if they could grow back down again? A new medical process is being attempted, and it's got an extraordinary aim: attempting to 'de-age' its volunteers back into young children.<br>The scientists don't know if it'll work. The doctors aren't sure if it should. And the friends and families of ...