Maomao from The Apothecary Diaries is 17 years old during the main story.

How old is Maomao?

  • Most official character profiles and fan wikis list Maomao’s age as 17 at the time she is working in the palace as an apothecary.
  • Her age is inferred from timeline details in the novels and manga (kidnapping, years of apprenticeship, and her current service in the Inner Palace), which consistently place her in her late teens, specifically 17.

So if you’re watching the anime or reading the manga/light novel around the current main events, you can treat Maomao as a 17‑year‑old protagonist. TL;DR: Maomao is 17 years old in The Apothecary Diaries during the main events of the story.