My car is 4 years old and I'm not sure if the belts and hoses have ever been replaced.

Does anyone know how many hoses would need replacing? I'm guessing a few coolant lines and maybe a few vacuum lines? Are all the oil lines SS or are some rubber too? I’ve seen vacuum lines get brittle and dry out over time.

Is the belt a single serpentine or are they individual ones? I’m guessing a single serpentine.

I'm going to do my first oil change soon and wanted to go ahead and do this maintenance on the car.

TIA!