Sayers was born in the Auckland suburb of Royal Oak, the son of Mary and Horace Sayers, a builder. He was educated at Royal Oak Primary School and Auckland Grammar School. His son, Greg Sayers, is an Auckland Councillor.
While at Auckland Grammar Sayers competed in the 1934 Melbourne Centenary Inter-Collegiate Games and won a silver medal, becoming the second fastest schoolboy quarter-miler in the British Empire. In 1938, although recovering from a serious car accident, he competed in the British Empire Games in Sydney, winning a bronze medal as part of the men’s 440 yards relay team.
Sayers won national 440 yards track title in 1937, represented Waikato in rugby union and played rugby league for one season, during which he scored a total of seven tries in a senior game on Carlaw Park, a record yet to be beaten. He coached track athletes, a number of whom won national titles, broke records and represented their country.
In the world of yachting he was chairman of both the Auckland P-Class and Starling Associations, the largest youth classes in New Zealand. As patron of the Manly Sailing Club, Whangaparaoa, he was partially responsible for the building of a new waterfront clubhouse including the raising of $70,000 towards its construction. He is also patron of the Hibiscus Coast Waterwise Society.
At the beginning of World War II Sayers enlisted in the 9th Heavy Artillery Regiment but was seconded into the New Zealand Navy (special branch), where he served as an intelligence officer reporting on enemy activity in the South Pacific. He is a member of the Kings Empire Veterans and the Silverdale RSA and, in 2003, was made a Member of the New Zealand Order of Merit for services to his country.
In August 2011, at the age of 96, he was entrusted by Sir Fred Allen, the only undefeated All Black coach with 37 games undefeated, to write his biography Fred The Needle which became New Zealand’s best seller during the week beginning 29 August 2011. He also gave the eulogy at Allen funeral at the age of 96. In 2014, aged 98, Sayers published his second book Deadline, which received wide publicity in the media, including a segment on the Seven Sharp national TV programme and articles in the NZ Listener, The Rodney Times and other publications. He turned 100 in December 2015 and died in Auckland on 19 August 2017 at the age of 101.
As chairman of the Hibiscus Coast Action Committee he won a bylaw outlawing life-threatening nets set amongst swimmers in shallow water along the Arkles Bay foreshore, the only bylaw of its kind in New Zealand. His services to the community have been recognised by an Athletics New Zealand Award, a Kiwi Bank Local Heroes Award, an Age Concern Senior Achievers Award and an Auckland City Council Award. On 6 December 2015 Sayers celebrated his 100th birthday, which was acknowledged by the Auckland Council.