YES. You can only import a used car in Pakistan, which is 03 years old from the year of manufacturing, i.e. in current year 2020, you cannot import a car which is older than 2017 made (2017 and above is only allowed). 2016 made, and older than 2016 cars will not get cleared by the Customs Department, as far as I know.
For Jeeps / SUVs, the limit is 05 years.