The answer to 'flat roof worn out' is that a flat roof that is worn out typically needs to be repaired or replaced. Common causes include age, exposure to the elements, poor installation, and lack of maintenance. Symptoms of a worn out flat roof include leaks, pooling water, cracked or peeling roofing material, and visible damage.
For minor issues, homeowners may be able to perform simple DIY repairs like patching small holes or cracks. However, for more extensive damage or if you're unsure of the cause, it's best to call in a professional roofing contractor. They can inspect the roof, identify the underlying issues, and recommend the best solution - whether that's a roof repair or a full roof replacement.