A teenage boy has married a 73-year-old woman in a remote village on Indonesia's Sumatra, officials said, after the unconventional couple threatened a double suicide if their match was thwarted.

Their romance began when septuagenarian Rohaya Binti Kiagus Muhammad Jakfar took care of her neighbour Selamet Riyadi, 15, who was suffering from malaria, the local village chief said.

"Selamet is too young to marry but we married them anyway because he threatened to commit suicide," village chief Cik Ani said.

"Since the boy is an underage, we have decided to carry out the marriage privately," he said.

Riyadi's father died several years ago and the boy was not properly cared for by his mother, who has remarried, Ani said.

Rohaya has been married twice before, both times to divorcees and has at least one child from the marriages, Ani added.

The marriage took place on Sunday in the remote Karang Endah village in South Sumatra province, but sparked national interest when a video of the couple's wedding vows went viral on social media outlets.

"He said he was madly in love. We love each other," Rohaya told reporters after the wedding.

The video shows the unlikely couple reciting their vows in front of their relatives and friends.

Under Indonesian law, the legal age for marriage is 19 for a man and 16 for a woman.

Source: Khaleej Times