A Seven-Year-Old Sprinter Costs More Than a Three-Year-Old Sedan (forcar.org)
Commercial vehicles ignore normal depreciation: a Mercedes Sprinter averages $38,678 at 6.9 years, a Ford F-450 $46,410 at 10 years. The used market prices them on earnings, not age.
Depreciation curves assume a car loses value as it ages. There's a corner of the used market where that barely happens, and the vehicles there are the least glamorous ones on the lot.