code: public static int computeAge(final Date birthday, final Date computeDate)
  	{
  		final Age age = new Age(birthday, computeDate);
  		return (int)age.calculateInYears();
  	}
docs: Computes the Age from the birthday till the computeDate object.
  
  @param birthday
  The Date object from the birthday.
  @param computeDate
  The Date-object from where to compute.
  @return Returns the computed age in years.