2-3 years is leasing territory (which some people do because they enjoy changing vehicles often.)

Car safety is much much better now than they were 5+ years ago however so it is not unreasonable for someone to change cars that often. I'd certainly not want to be in a 10yr old car in a highway accident if I could help it.

(Also, some newer cars are just nicer to drive with creature comforts people care about)