Four childhood friends in their twilight years--Billy, Paddy, Archie, and Sam--reunite in Las Vegas to celebrate Billy's impending wedding to a woman half his age. The last time they were together, they were young men in Brooklyn; now, as seniors, they're determined to relive those glory days and buck the pressures of age. While Billy, the charming bachelor finally settling down, looks to throw the party of a lifetime, Paddy is grappling with the loss of his wife a year earlier, and his subsequent withdrawal from social life.

Upon arriving in Sin City, the quartet is swept up in the extravagant lifestyle Vegas promises. Archie, having slipped away from his overprotective son, is yearning for freedom and eager to let loose, while Sam, granted a pass from his Florida retirement village (and wife), hopes to spark some of the enthusiasm from his youth. As they navigate the array of casinos, clubs, and swimming pools, their longstanding rivalries and romances flare up. The friends are forced to confront their pasts and present realities, testing the bonds of their friendship amidst the backdrop of Vegas spectacle and the ticking clock of their golden years.