How the average age of Hearts and Hibs' squads compare to Scottish Premiership rivals

Hearts and Hibs are two of the best clubs in the Scotland for producing talented youngsters.
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There is plenty of promise around Ryan Porteous, Fraser Murray, Harry Cochrane and Aaron Hickey. But does that make the Edinburgh duo the youngest squads in the Scottish Premiership? The league itself has an average age of 26. Where do the Capital pair place?