+/** This function creates a new age_value struct and initializes it properly,
+ or copies an existing age value.
+
+ \param copy_from A given struct age_value to copy (or \c NULL).
+
+ \return If the parameter \c copy_from is NULL, a new value is created and
+ given initial values. If it is non-NULL, the given value is copied into
+ a new age value. In both cases, the new value is returned.
+*/
+struct age_value* gedcom_new_age_value(const struct age_value* copy_from)