Marco, Tato, Serena, and Leo are nine years old, and they are inseparable friends, ready to defend each other from their schoolmates’ bullying. On the evening of Marco's birthday, all four find themselves together to blow out the candles and unknowingly make the same wish: become adults. In one night's time, they find themselves magically the same age as their parents, but with the same behaviour and thoughts they have as kids.
Unfortunately the movie Da grandi is not yet available on HBO Max.
| Writing | Franco Amurri | Original Film Writer |
| Art | Pasquale Tricoci | Production Design |
| Costume & Make-Up | Elena Minesso | Costumer |
| Editing | Luciana Pandolfelli | Editor |
| Directing | Fausto Brizzi | Director |
| Production | Roberto Proia | Producer |
| Writing | Fausto Brizzi | Writer |
| Sound | Andrea Bonini | Original Music Composer |
| Camera | Federico Annicchiarico | Director of Photography |
| Sound | Bruno Zambrini | Original Music Composer |
| Crew | Riccardo Gruppuso | Mix Technician |
| Sound | Fernando Alba | Music Producer |
| Production | Simone Bencini | Associate Producer |
| Production | Gianluca Leurini | Executive Producer |
| Production | Stefano Rabbolini | Casting |
| Production | Andrea Goretti | Associate Producer |
| Directing | Chiara della Longa | Assistant Director |
| Sound | Francesco Vallocchia | Sound Mixer |
| Directing | Fabio Guaglione | Action Director |
| Production | Edoardo Moracci | General Manager |
| Art | Roberto Sileo | Set Decoration |
| Writing | Franco Amurri | Co-Writer |
| Production | Ferdinando Cocco | Production Director |
| Directing | Emmanuele Bianco | Second Assistant Director |
| Writing | Stefano Sudriè | Original Film Writer |
| Sound | Fabio Felici | Sound |
| Sound | Thomas Giorgi | Sound Effects |
| Crew | Monica Verzolini | Post Production Supervisor |
| Crew | Maria Gnecchi | Stunt Driver |
