The lifespan of a roof depends on several factors, including the type of roofing material, quality of installation, and climate. Asphalt shingle roofs typically last around 20-25 years, while metal roofs can last up to 50 years or more with proper maintenance.

Signs that your roof may need repair or replacement include leaks, missing or damaged shingles or tiles, excessive granule loss, and sagging or uneven rooflines. It's important to have a professional roofer inspect your roof regularly to identify potential issues before they become major problems.

When hiring a roofing professional, look for someone with experience and a good reputation in the industry. Check for licensing and insurance, ask for references, and get a written estimate outlining the scope of work and associated costs.