Why do so many old rockers go out on stage sporting a face that looks like a chewed toffee?

Why do so many old rockers go out on stage sporting a face that looks like a chewed toffee?
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As much as I love old bands, many bands are just are marketing a memory. It's not about music, it's just grasping for relevance.
Why do so many old rockers go out on stage sporting a face that looks like a chewed toffee?
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