The song "Lifetime Love" by Joyce Sims is about finding true love and offering a lifetime of commitment. The lyrics suggest that the singer has been searching for love and finally found it in someone special. They believe that this person holds the key to their heart and has opened up doors that were previously closed. The singer expresses their desire to leave behind their secret lovers, indicating a newfound loyalty and devotion to the person they have found. They are confident that their love will last a lifetime and assure their partner that their love has no limits, comparing it to the vast skies. The song emphasizes the singer's dedication to their partner and promises to provide a lifetime of love and satisfaction. It conveys a sense of joy and fulfillment in finally finding true love and expresses gratitude for the person's presence in their life. Overall, the song's message revolves around the depth of love and commitment the singer has for their significant other.