Both King Charles III and Queen Camilla were in their mid-70s when they took the throne, making Charles the oldest monarch at the time he became king, so a short reign is a real possibility. If Charles dies first, Camilla would most likely become queen dowager, according to Cosmopolitan. A queen dowager is effectively a widowed queen, who maintains much the same place of honor as she's always had while otherwise stepping aside for the next queen in the line of succession.
In Queen Camilla's case, the next queen would be Catherine, Prince of Wales, wife of Prince William, Charles' eldest-born son. Per UnofficialRoyalty.com, Queen Camilla might choose to eschew the "queen dowager" title entirely and revert to "queen consort," instead. Some queen consorts have done so in the past. In the event of Charles' death, Camilla might also elect to become queen mother, according to the Royal Collection Trust.
