Name: query_age - return the age of a living

Syntax:
	int query_age()

Description:
	The query_age call returns the age of a living.

Return value:
	A positive integer meaning the number of heart_beats (2 seconds).
	Note: monsters mostly are older than indicated, because they turn
	their heart beat off if no player is present.

Examples:
	int age;
	age=this_player()->query_age();

See also: living/show_age, object/heart_beat