The lifespan of a prelit Christmas tree can vary depending on several factors, such as the quality of the lights, the care and maintenance it receives, and the frequency of use. On average, prelit trees can last anywhere from three to five years or more if properly cared for. To maximize the longevity of your prelit tree, it is important to inspect the lights for any damage or malfunction and replace any burnt-out bulbs as needed. Additionally, storing the tree in a dry and cool place when not in use can help prevent deterioration and extend its lifespan.