Channel 5 has recommissioned Age Gap Love, as well as five other documentaries.
Can't Pay? We'll Take It Away, The Nightmare Neighbour Next Door, Countdown To Murder and Autopsy: The Last Hours Of are all to return later this year, after successful debut outings.
She's 78, He's 39: Age Gap Love - review: Did you watch?
Age Gap Love follows the lives of couples separated by large age differences. The last series featured the relationship of 78-year-old Edna and 39-year-old Simon.
The show's executive producers are Nine Lives Media's Cat Lewis, plus GroupM Entertainment's Abigail Adams and Tony Moulsdale.
The second series of Autopsy: The Last Hours Of will look into the sudden deaths of Karen Carpenter, Brittany Murphy and Michael Hutchence. The Potato Productions series is fronted by forensic pathologist Dr Richard Shepherd.
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Also returning are Touch Productions' Can't Pay? We'll Take It Away, which explored families struggling with debt, and Flame TV's The Nightmare Neighbour Next Door, after it drew in 1.7m viewers in its first series.
Crime documentary Countdown To Murder promises to investigate more horrific killings across Britain, and will be produced by Crackit Productions.
"We've had a great year with strong ideas that are engaging with our viewers," said Channel 5's director of programming Ben Frow.
"One of my promises was finding returnable hit series, and these shows prove we are delivering on that commitment."
Watch a clip from the first series of Age Gap Love below:
