First time I watched greece I think I was about 10. My mother worked in a video shop and TBH I think I watched a lot of films that probably weren't suitable, nothing x-rated, but prob definitely films that were rated 15. I just liked all the music and the story went over my head. My favourite film though was dirty dancing and I watched that when I was 12 and loved the music, and although I did understand totally what the story was about, the music took over the story imo, so i don't think it had any detremental effect on me.
I think that there's only so much we can stop our kids from watching/hearing. Greece is deemed suitable to be shown on ITV before the watershed, but it is edited, however some of the music that is in the charts is definitely not edited and it is impossible to stop our kids listening to that.