A group of four lifelong friends, now in their golden years, decides to take one last trip together to Las Vegas to celebrate the wedding of the group's bachelor, Billy. Michael, the pragmatic one, is played by Robert De Niro; while Morgan Freeman portrays a newly retired man seeking new experiences. Also in the group are the funny yet slightly crazy Sam, played by Kevin Kline, and the charming but somewhat melancholic Archie, portrayed by Freeman.
As they arrive in Sin City, the friends confront the reality of having grown older and their own fears and challenges. However, Las Vegas has a strangely revitalizing effect on them, leading them to experience a series of wild and outrageous adventures they never imagined. From nights of unrestrained partying to unexpected encounters, the four friends reconnect with the excitement of their youth while grappling with the pressures of adulthood.
Through comedic situations and a touch of nostalgia, the film shows how time can affect friendships but also how it can revitalize them. Set against the vibrant backdrop of Las Vegas, the story explores not only fun and adventure but also the importance of friendship and how it's never too late to make the most of life. In the end, these friends learn that while age may change the body, the youthful spirit can always remain alive.