Mi alma por un amor (1964)

Faustino, an elderly man, falls in love with a college student named Marga but knows she can't love him because of his age. As a result, Faustino sells his soul to a devil to make him young and rich for the 6 months he has left to live so he, with the devil's help, can try and win Marga. At the same time, Marga has her guardian angel, Ángela, who works to keep Marga's soul safe from the forces of evil.