相关规则
Sweden
Practice Relating to Rule 138. The Elderly, Disabled and Infirm
Sweden’s IHL Manual (1991) provides:
It is also possible for the parties to reach an agreement during a conflict that all acts of war shall cease temporarily within a given part of a conflict area. Such agreements are commonly made to afford protection to civilian populations, and specially to such exposed groups as … old people. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 3.4.1, p. 84.