I know my credit score has something to do with it, for some reason. I've talked to an insurance actuarial and they use that in their premium formula.
e. as my credit score went +100 pts my insurance went down, co-incidentally? Liability only, so it isn't depreciation of the asset. If anything, on average, an older car would be more dangerous, more liable to have the wheel fall off and collide with a Bentley or something.