know the new carS do not have cassette tape player do the old vehicle still have cassette players I do not have old car?

Cassette players have not been factory-installed in cars for probably 20 years.

My car (2004)  has a cassette player , never used as I stopped using cassettes about 10 years before that.

No, the magically evaporated. 

i took the cd player out of my 2011 toyota and replaced it with an android unit I haven't even got any cd's left . I haven't brought or played any cassettes this century it was around 2002 I ripped every cd I owned to mp3, even in 2002 I had a mp3 player in the car. it did use a cassette type interface to plug into the old tape player, 5 cars ago that was.

Cassettes and CD's are old school. It's time to jump into a 2021 vehicle with touchscreen HU's.

Most cars with cassette players are now in junkyards.

It's hard to find a car with a CD player, much less a cassette player.