Meet the couple who prove that age is no boundary when it comes to love, after meeting over the back fence 54 years ago.

Pam and Ronald Sinclair recently tied the knot after first meeting in their early 20s when they were neighbours in Strathpine on Brisbane's northside.

"We had a bushfire next door and Ron came over and helped my then husband to put out the flames," Pam said.

"The friendship then grew with Ron and his wife, and myself and my husband for many years.

"We travelled the world together and our children grew up together."

As the years went by Ron lost his wife and Pam also lost her husband.

"We didn't see each other for a long time, and then Ron rang me one day and asked me to go and see some live music as friends," Pam said.

Pam Sinclair walked down the aisle with family by her side. ( Supplied: Gabrielle Lyons )

"We did that a few times and then we realised there was a spark there."

Ron proposed to Pam on bended knee, but not everything went to plan.

"I got down on my knees when I proposed, but I couldn't get up," Ron said.

"I had to help him up and we ended up rolling around on the floor in laughter," Pam added.

"So a warning to elderly people — don't get down on bended knee unless you can get up."

The couple organised their wedding in only six weeks, holding a ceremony and a reception at a local hall and walking down the aisle to Nat King Cole's Unforgettable.

Pam chose a blue dress for the occasion, not wanting "to look like a marshmallow".

"We decided to do it and people were telling us we wouldn't pull it together in time ... but we did," she said.

'You've got to play till you cark it'

Ron said people were never too old to tie the knot.

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"There's too many lonely people out there that don't get around to doing it and then it's too late," he said.

"I'm 80 at Christmas and you've got to play till you cark it."

Pam agreed, adding that she hoped others would take the plunge.

"It's lovely in our golden years to have each other and I say go for it ... don't waste your time."

Granddaughter Gabrielle Lyons said the family, especially her cousins, were excited to be part of the big day.

"It's really sweet seeing my grandma getting all giddy and girly over a boy even at her age," she said.

"I think now we are so quick to judge romance thanks to apps and modern dating.

"But as soon as Ron saw my grandma walking down the aisle he burst into tears; it was beautiful to see just how much he loves her and perhaps always has."