Well....I was 15 and my dad bought tsrts on dvd. I was in no way into rock music of any kind, I was alright with my britney and my destiny's child, but he played stairway and I was caught. I think we are most susceptible to stairway if haven't had any previous experience of rock music. Led Zeppelin was the reason I "grew up" and started digging into the 60's and 70's and got me into music like floyd, janis, hendrix etc. Still, Zeppelin is my favourite band of them all!