Paul Anka on his HBO original documentary, ‘Paul Anka: His Way,' and maintaining an active touring life at 84: ‘Who the hell would turn that down?'

I’m so young and you’re so old,” Paul Anka sang in the very first line of his very first hit, “Diana,” in 1958. It’s the kind of lyric you could seemingly only get away with when you’re 15, as Anka ...