When it comes to a vintage car it depends on much more than how old it is.
You have to measure the depth of the paint and visually inspect it for primer peeking out of the edges.
Is the car on factory paint?
Does the car have oxidation?
Does the car have deep swirls?
Has the car been 'kamponded'(desi compound on a wool pad with a crazy rotary)
Does the car have a custom paint job?
Is it clearcoated?
Is it metallic?
I remember @vague_one once got a vintage benz which was barbarian compounded several times and the factory paint job was on its last breath. He clayed it and didn't even polish it. Several rounds of m07 glaze with the correct technique and with hard work, the paint looked like new and all the imperfections were masked. Zero abrasives used.
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