All shingles, whether organic or glass based, will be subject to UV rays from the sun, causing the asphalt coating to dry, loosening the granules covering in the long run. Just like people, asphalt shingles gradually change with the passage of time. Signs of this aging process may appear as early as the first couple of years, during what is often called the Curing Phase. At first, you may notice small surface cracks, or a few small blisters. These changes will not affect the ability of the asphalt shingles to protect your roof, and are an anticipated part of the aging process.