what was the first rock concert you attended and how old were you?

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403. Wasn't "rock", but it was The Man

Johnny Cash with June Carter and the Carter Family (including Maybelle). Also on the bill were the Statler Brothers (Flowers on the Wall), and the now-legendary great Carl Perkins. A great, great show.
The place? Carnegie Hall in NYC - I think it was 1966, which meant I was 12. My older sister, who at that time worked on Madison Ave in a kinda "Mad Men" small adv. firm, got the tkts. We camped at the backstage door after the show and saw them all come out.
Carl Perkins came out carrying his guitar in case - no limo, no cab. Set down his guitar and talked with us and signed the album my sister took with her. Then he picked up and walked away down the street!
It wasn't until '68 that I saw another - this time at the old NY World's Fair site in the NY State pavilion. It was a awesome blues show with Muddy Waters, Howlin Wolf, I think Buddy Guy. But the headliners were a new "blues band" from England called Led Zeppelin. We stood right by the stage - there wasn't many left at that point, with the majority of the audience showing up to see the real legends.
Many, many since - one of the most memorable was Jimi Hendrix at the Fillmore, New Years Eve '69 - the Band of Gypsies show.