George Kirby will turn 103 when he marries his longtime love Doreen Luckie on June 13 at the hotel where they live in Eastbourne, East Sussex.
The pair - who have seven children, 15 grandchildren and seven great-grandchildren between them - have been together for 27 years and have finally decided to make their union official, 'ITV News' reported.
"I suppose it's about time, really. I definitely don't feel my age - Doreen keeps me young. I didn't get down on one knee, because I don't think I would have been able to get back up," said Kirby.
"I didn't think that was possible, because you hear so many people living into their hundreds now, and lots of people in their nineties, I thought 'well, we can't be the only ones'," she said.
Kirby met Luckie when he was 76 and just divorced, while Luckie had become a widow three years earlier, in 1988.