Format intervall as hours/minutes etc

Hi all. Any hint on how to format this interval as number of hour/seconds etc?
select age('2007-09-22 17:00'::timestamp, '2000-02-20 18:00'::timestamp);
age
-------------------------------
7 years 7 mons 1 day 23:00:00

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Andreas Joseph Krogh <andreak(at)officenet(dot)no>
Senior Software Developer / Manager
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