Ron and Joyce Bond, aged 102 and 100, said a bit of "give and take" was the secret of a long-lasting marriage.
The pair have seen 15 different Prime Ministers take power since they were wedded in 1941 after a "love at first sight" meeting.
A couple previously thought to be the record-holders - Ron and Beryl Golightly from Yorkshire - were married for 80 years before Ron sadly passed away aged 101 in December.
Joyce, a former Woolworths worker, said: "We never expected to reach 81 years of marriage, we know we are very fortunate to have achieved this amazing goal.
"It feels excellent! There is no boss in our relationship, we both give and take."
The couple - who are now great-great-grandparents - married at Newport Pagnell Registry Office when Ron was 21 and Joyce was 19.
Ron, who served in the Second World War before working at a local garage, said: "Sometimes life is hard but we work through it together. We look after each other too."
When asked if it was love at first sight both Ron and Joyce gave a unanimous 'yes' without hesitation.
The couple celebrated their anniversary at ExtraCare's Shenley Wood Retirement Village in Milton Keynes, where they share a flat.
They were treated to cream teas and got a shout out from Ken Bruce on Radio 2 at the request of son Bill.
Last year the Queen sent them a signed letter for their oak anniversary, which read: "How wonderful to learn of your eightieth wedding anniversary on 4th January, 2021. I do hope you enjoy this marvellous occasion."
Daughter Eileen said that her parents' friends initially doubted how long the couple would last when they married 81 years ago.
Eileen said: "My parents are a truly inspiring couple, not only to my brother and I but to their grandchildren, great-grandchildren and great-great-grandchildren.
"It was said of them at the time of their wedding, it would not last long, how wrong did folks get that?”