Conversation so far:
how old was Imran khan at the height of his career?
At the height of his career, in 1982, the thirty-year-old Khan took over the captaincy of the Pakistan cricket
how old was Imran khan when he took the last winning wicket?
At the age of 39, Imran Khan took the winning last wicket himself
who was Imran khan?
Imran Khan is the 22nd and current Prime Minister of Pakistan. Imran Khan was also an international cricketer and captain of the Pakistan national cricket team
when was Imran Khan captain?
Imran Khan served as the team's captain intermittently between 1982 and 1992

Question: where was he captain?
Self-contained rewrite: where was Imran Khan captain?