From what I know, every car needs spark plugs to run. So yes all cars, whether new or used, have them. Normally you are suppose to change them when you get a tune up on the car. And that depends on the last time the oil was changed. Because that is all done at the same time if you take it to a shop for tune up.
New cars only require tune ups at 100,000 miles because the newer spark plugs last longer The unfortunate thing is that after 100,000 miles the spark plugs can be difficult to remove and that can lead to a more costly repair