I'm going bend the rules a bit by suggesting that the age range is for
human characters, and other entries from races should be comparably aged with respect to their different lifespans... and then take advantage of this: Akane from
Totsugi Okureta Kitsune ga Yome ni Kuru Hanashi. In human years, I'd put her in her mid thirties - she's old enough to have a fair bit more life experience than her younger sister (the FMC of the series), who is implied to be a Christmas cake herself.
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She is technically a widow, with her husband having died on their wedding night (no, not from
that), and hasn't tried to get back into a relationship since. She also has a mischievous side (like most tanuki) that comes out fairly frequently.
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This gets balanced with her being
exceptionally good at using various kinds of magic, to the point where she has at least one god trying to recruit her.
(Also this is another chance to plug this series - it really is very well written, and
@sarusa and team have done an excellent job with their translation, so you should go read it.)