The Last Birthday (2025) is a Drama, Thriller film that follows a large family gather to celebrate a birthday. It would seem like a great reason to get together. But the family is just a project of one of the "brothers" — an experienced psychologist who is conducting an experiment to create a "happiness formula". He believes that manipulating others, their emotions and desires, will make them happy. However, love interferes with the mathematical calculations, which can neither be calculated nor predicted. The Last Birthday is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 4.6 out of 10 from 7 votes. Fans of drama movies may also want to explore similar titles below.