My dealer assisted in finding a local ( in the same state ) credit union that would loan on a 2003 at 5 % .. Required a higher down payment based on nada value and only since our Fico was above 800 to boot.
2006 was the magic number at least least year , probably 2007 by now that it became more difficult even with good credit to get a loan or rates went up to the 10% range if they even talked about it !
8 years appear to be the new line . I imagine that that will drive down values at 7-8 years as it dramatically lowers the buying pool to cash buyers or buyers with enough home equity to tap
Bill