Is there anyway I can listen to music from my iPhone in an older car?

I have a car from 2008 but it has no USB ports.

Yes you can get a 12 volt Bluetooth adapter, it plugs into the cigarette lighter thing in your car.

An fm adapter is good, but you have to find an unused frequency, and as you drive around you might hear stations on that frequency. You can use a cassette adapter if your car has a working cassette player.

Fit a modern sound system

Yes, go out to a casino and hit the jackpot to win $40,000.

Then you can invest into a high performance SPL sound system.

Sux to be you! Maybe you should try using the RADIO to listen to music. That's what it was built for!

Buy a Bluetooth speaker.

I use an FM modulator. It works beautifully with no static or interference. If you old car has a cassette player, you can use a cassette adapter. Those are cheap and work well, those some present mechanical noise.