You can, of course, do that.

However, you’re trading the reduced depreciation (in years 9 and 10 compared to years 1 and 2) for increased maintenance and repair costs (in years 9 and 10 compared to years 1 and 2).

One of the things to note is that most new-car warranties in the US cover the first 36 months or first 36k miles, whichever happens first. Since the average car gets driven about 13.5k miles per year, the warranty will actually only last (on average) 2.5 years.

Thus, buying a 2-year-old car not only increases the average age of the car you drive by a year or two, it also removes about 80% of the effective length of your warranty.