There can be reasons for this other than steel or build quality. For example a car which has spent much of its life in London where roads are generally not gritted in Winter will fare better than one kept elsewhere. Likewise cars in coastal towns generally fare badly with corrosion.
My 05-reg has just needed its first corrosion repair, an offside rear sill panel welded in. Back in the day it wasn't uncommon to see Austins, Morrises etc with the wheelarches rotted away at 18 months old.
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