Mirko (Rumi Usagiyama) from My Hero Academia is generally listed as being 26 years old at the time of her first appearance in the series.

Quick scoop on Mirko’s age

  • Most character guides and fan databases give Mirko an age of 26 at her debut.
  • Some timeline analyses and fan discussions suggest she’s in her mid‑to‑late twenties as the story moves into later arcs, usually still treated as around 26–27 rather than 30+.
  • Official material highlights her as an adult pro hero, already established and highly ranked, which fits that late‑twenties range.

Why there’s confusion

  • The manga and anime do not prominently spell out a precise, always-updated age for every point in the story, so fans piece it together from guides, profiles, and chronology discussions.
  • Some blog posts and fan sites speculate slightly higher ages (like 29) by extrapolating the in‑universe timeline, but these are interpretations , not clearly labeled canon.

In short: if you’re answering “how old is Mirko MHA?” for a forum or wiki- style post, the safest and most widely accepted answer is 26 years old at her first appearance, treated as mid‑twenties throughout the main story.

TL;DR: Mirko from My Hero Academia is typically given as 26 years old when she appears in the series, effectively placing her in her mid‑twenties as an established pro hero.

Information gathered from public forums or data available on the internet and portrayed here.