If you car is older, you might try to add Bluetooth through an adapter. There are several out there you can look at to see what will work for you. Some require an AUX input and/or USB port. Some even come with USB ports if you don’t have them.
But why add Bluetooth to an older car? You might want to stream music. You may even want to use it for hands-free phone calls. There are a few available that will allow you to stream through your car stereo speakers or you can get a Bluetooth speaker that will cost a bit more.