Mr Milford is 101 and Mrs Milford will turn 101 next month, making them both the only living couple to reach a century.
The pair, who have two children, five grandchildren and seven great grandchildren, say they still have little arguments, but will always have a kiss and cuddle before they go to bed.
Their 74-year-old son, also called Frank, said the secret to their parents' successful marriage was simply being happy with each other.
He said: "They've enjoyed themselves, enjoyed their lives very much but they've been always very content with their lot."