Ian Hunter is about 70 years old. He's played with/written for/etc. Mott the Hoople and had a long career as a solo artist. He's been putting out good... no, *fucking good*, albums for a long time. He's a rocker.
I already know that Ian Hunter is a rocker. How can you tell (assuming you don't know how) that Ian Hunter is a rocker? You can watch this video.
He's a fucking rocker.