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*According to the source, this list only includes characters who have died on the TV show, but may still be alive in the books.
The source calculated the age as follows:
"Characters of unknown age have been treated as follows: Characters with an unstated age but whose births and deaths can be referenced back to other events are tallied using those references, typically marriages, births, and battles;
Characters for whom a reasonable estimate is available have been rounded to the nearest 5 year interval;
Characters for whom no estimate is stated have been replaced with the age of the actor or the actress at time of filming;
Characters for whom no age is known and for which no estimate is available have been excluded from the analysis (see raw data);
Characters who have come back to life multiple times and/or transformed into some nonhuman sort of being are ignored because, come on. Dragons, direwolves, etc. are also excluded."