Your ears are one of the most awesome tools you have at your disposal. You get to listen to awesome music and talk to those around you with ease and remain aware of threats like cars when crossing the road. As you age your hearing will decay naturally, however you can prevent your hearing from worsening by doing things such as wearing earplugs for noisy situations like concerts or Mediterranean family gatherings and keeping the volume of the music you're listening to at comfortably low levels, whether you're listening through headphones, speakers or sound systems like those in cars.
At the same time. be sure to respect the hearing of others. Avoid yelling or speaking too loudly, even more so when in close proximity to one's ears. Warn those around you if you're going to do something which will make lots of noise. If you have guests with you at your home or in your car, be considerate and keep the volume at a comfortable level (a good rule of thumb is if you need to raise your voice to be heard over the music, then the music is too loud). Remember that some people might find it rude to ask you to lower the volume when they're uncomfortable with the volume, so make the effort to ensure everybody's hearing, including yours, are in good hands :)