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Usually somewhere around 20 years for a 40'' 20 lb fish.
Check this out as I mentioned in an earlier post - life span varies on climate. http://www.wildernessisland.com/WalleyePikeAgeSize.php#.WNAfWmVIh2sI caught a 45 inch pike 2 years ago on a fly in Northern Ontario. Province of Ontario estimatesthe age of the pike at 23-24 years old.
http://www.wildernessisland.com/WalleyePikeAgeSize.php#.WNZcy_cpDqA