Given the task definition and input, reply with output. In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: He progressed through the youth system at Plymouth Argyle to make his first team debut in November 1979 against Colchester United. Having established himself as a regular on the left side of midfield, he scored his first of 18 goals for the club in January 1981 against Millwall. Cooper became one of the youngest players to captain a side in the Football League, at the age of 22, when he was given the armband by Johnny Hore, the club's manager and a former Argyle player. He helped the club reach the semi-finals of the FA Cup in 1984, leading the side out against Watford at Villa Park, but his stray pass led to the winning goal for their opponents. He lost his place in the side the following year before being converted into a full back, and he was a key member of Dave Smith's team that gained promotion to the Second Division in 1986.
Link Information: none Question: How many years had Johnny Hore, who gave Cooper the armband at age 22, play for Plymouth Arglyle?
Answer: none