Mary Poppins I was four.
I still remember the scene where the children take the medicine and it comes out in different colors and the scenes of the chimney sweeps dancing.
That was probably the first film for most children in the US of my generation. That - or
The Sound of Music or for those a little older,
The Parent Trap with Hayley Mills.
I remember my mother saying that Bing Crosby and Bob Hope were the definition of "star" for her, even when she grew older, because when she grew up they were the biggest names around. For me, it was Julie Andrews and Paul Newman.
I didn't grasp the concept of sets at the time. I thought that really
was London. I became interested in European cities and maps because of that film; soon I had maps of Britain and even of London.
Then I saw it many years later, and realized it was a set!!