I have three working vehicles. Four if you count my motorcycle. Two are 16 years old. A prius and a sienna. One is 18 years old. A mazda tribute. My motorcycle is 28 years old. A Suzuki bandit. I don't even own a vehicle newer than 16 years old. Did just junk an 18 year old Nissan altima because my 16 year old kid blew up the engine after way over filling the oil.

Chances are you aren't seeing 1 in 4 vehicles on your route that are over ten years old. But part of the reason (but not all the reason) is the same reason you never noticed how many of the vehicle you drive were out on the road until after you bought one. You're never looking around and thinking about it.

Also your location and what you do for a living. You a white collar going into a nice office area at 8 am or so? Newer vehicles. Go head to the old or run down portion of a city and you'll see 20 year old vehicles abound. My area has several well off rednecks that drive old fixed up diesel pick up trucks just because they don't like all the tech and tracking and Def fluid requirements on the ones from the past 15 years. One of them is currently thinking about buying an early 90s dodge Cummins for like $30k he looked at.

Myself, I like doing shade tree mechanic stuff and think it's dumb to spend a lot of money on a vehicle that looses $5,000 of its value after you drive it out of the lot. I've never had a car payment, always paid cash, and always done my own automotive work. I've spent 25 years just buying 10+ year old vehicles. Newest I've ever owned was 8 years old. Even now we're about to downsize on the minivan we don't really need any more and replace it with a 2007 matrix if we buy it, tomorrow.