David Lee Roth wasn’t meant to be 70.

The rest of us can grow up and grow old. Roth, no, that’s not how it was supposed to go. Diamond Dave should be 29 forever, charming, clownish, rakish, and tousling his hair in the “Jump” video. Instead, Roth is 70 and back on the road for the first string of gigs in half a decade — he’s at the Hampton Beach Casino on Aug. 13.

Hard rock typically means hard living so most of the genre’s singers don’t age well. For every ace still doing their music with moxy and a strong set of pipes — Bret Michaels, who played Boston last month, is a great example of a frontman with his charisma intact — there are three or four who fall abysmally short. Too many refuse to admit they can’t sing or move like they once did so they muddle through sets pretending they don

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