Regular sealcoating not only improves your curb appeal, but is also essential in attaining full life from your asphalt. It adds a layer resistant to chemicals, as well as the elements, that all degrade asphalt over time.
Cracks are going to happen in asphalt, but it is important to not leave them unchecked for too long. Water seeps into cracks and the freezing and thawing in winter months can turn that little crack into a big pothole.