É meraviglioso essere giovani

I saw this film about 55 years ago. And it is still in my mind fresh and clear. It brought me more emotions than any other film by John Ford, Ingmar Bergman o Woody Allen. Some one told me that the incredible, fantastic, young girl (five or six years old, white boots) dancing "claqué" (I think some English speakers name it Tap dance or something like that...), when the film is near its end, was the daughter of Sir John Mills, the well know Sarah Mills, a lot of years before Ryan's Daughter, and so on... Is it true? Some one knows? Just speaking about all that things make me feel 55 years younger... And, by the way, I have a light notion about the musicians. They were the Ray Martin Orchestra, is not it? The same people that in other memorable french film, "A la mi-Aôut"...