The answer to 'why is my asphalt shingles worn out' is that asphalt shingles typically have a lifespan of 15-30 years, but various factors can cause them to wear out prematurely. Common causes include exposure to UV radiation, extreme weather, improper installation, and lack of maintenance.
Signs of worn-out asphalt shingles include curling, cracking, bald spots, and granule loss. If your shingles are exhibiting these symptoms, it's likely time to consider a roof replacement. While some minor repairs may be possible as a DIY project, it's generally best to have a professional roofing contractor assess the condition of your roof and provide recommendations.