I reckon its the late โ€˜80s and early โ€˜90s. Discuss below.

Vintage muscle: Raw power, carburetors, bias ply tires, no driver aids or safety whatsoever, wet noodle, rode like a truck compared to today.

Modern muscle: Controlled power, modern fuel injection, large concessions to safety, handling, driver aids, and interior quality.

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Mid-age muscle: Somewhere in the middle on all aspects (except power - which is lower than both - but so is the price.)