Eduardo and Antonia are a mature couple excited about their daughter expecting their first grandchild. But life will change completely when some laboratory tests confirm that it is Antonia who is pregnant and not her daughter. This unexpected situation strongly influences the character of Eduardo, who begins to live what he calls a "second youth".
| Actor | Role |
|---|---|
 Paco Martínez SoriaEduardo Contreras | Eduardo Contreras |
 Florinda ChicoAntonia 'Antonina' Galíndez | Antonia 'Antonina' Galíndez |
 José SacristánClaudio Caminero | Claudio Caminero |
 Rafaela AparicioDoña Catalina | Doña Catalina |
 Antonio FerrandisRamón | Ramón |
 Mirta MillerElisa | Elisa |
 Mary Paz PondalCuchi | Cuchi |
 Rafael López SomozaDr. Federico Fernández Pérez | Dr. Federico Fernández Pérez |
| MMaría Luisa PonteEsposa de Ramón | Esposa de Ramón |
 Ricardo MerinoAlfredo Miranda | Alfredo Miranda |
 Venancio MuroConductor del motocarro | Conductor del motocarro |
 Mariano Ozores PucholNot listed | Not listed |
 Erasmo PascualAdministrador comunidad de vecinos | Administrador comunidad de vecinos |
 Valentín TornosAmigo #1 | Amigo #1 |
 Carmen Martínez SierraMartina (as Carmen M. Sierra) | Martina (as Carmen M. Sierra) |
| MMarcial GómezNot listed | Not listed |
| JJosé YepesNot listed | Not listed |
| AAntonio OrengoNot listed | Not listed |
 Saturno CerraNot listed | Not listed |
 María José GoyanesPili | Pili |