The honest answer for a Priceville house built around 2004 is that the torsion spring is probably still the one that came with the door, and torsion springs don't last forever regardless of how well the house was built. When it goes, it usually goes without much warning - a loud bang, then a door that won't lift, or one that lifts a few inches and stops. The opener is the other original part worth watching; builder-grade units from that era weren't built for a twenty-year service life, and a motor that's starting to strain or a logic board that's glitching is often cheaper to replace outright than to chase. Rollers and cables wear more gradually and tend to show themselves as noise or a door that runs crooked in the track before they fail outright. One thing we won't do is talk you into replacing a whole door system when the fix is a single part - if the spring's the only thing original to the house that's worn out, that's the repair, not an excuse to sell you a new door.