Lenny Feder has relocated back to his hometown with his family to be closer to his childhood friends Eric, Kurt, and Marcus. As the last day of school begins, they look forward to enjoying the summer. However, Lenny soon discovers that despite leaving behind the high-paced city life, the challenges of parenting, dealing with old and new relationships, and wrestling with the demands of adulthood remain as demanding as ever. His friends are no different: Eric faces the pressures of being a stay-at-home dad, Kurt tries to bond with his teenage son while keeping his own youthful inclinations in check, and Marcus learns that he has a son he never knew about.

To recapture their youth, the friends decide to throw a massive summer bash reminiscent of their glory days. However, their plans quickly spiral out of control as they encounter a series of comedic misadventures involving bizarre yoga instructors, school bullies, and unexpected visits from Lenny's old nemesis. Through the chaos, they learn valuable lessons about family, friendship, and growing up—even when they're technically supposed to be all grown up already. The story portrays how life in their hometown brings both laughter and challenges as they navigate the fine lines between maturity and staying young at heart.