3 of them don't look like it but they're supposed to look older since they use the art style called chibi which makes them look young
The 18-year-old is just very short and in the show, they make fun of her for that
The 29-year-old is an excuse that being a gamer gives you less stress and she's also short
The 57-year-old actually does show her age later on the show as she develops crow feet and laughs lines
The rest is just complicated and outrageous
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