I was thinking, when I read that Bush continued reading after hearing about the first attack on the WTC, it occurred to me that I would have done the same thing. I don't handle surprises well.
Of course I'm not president.
I believe I was 13 when I went to see "Alice's Restaurant", which was rated R. It was running as a double feature with "Yellow Submarine" I carefully worked out my birthdate, to make myself four years older. But the woman at the movie theater never asked for anything except money.
I've seen twelve year olds buy tickets for R rated movies. The clerks are, mostly, kids themselves, and they don't care.