how old is all might

All Might, also known as Toshinori Yagi, is most likely 49 years old according to the timeline in My Hero Academia. This age is derived from the fact that he is three years older than Endeavor, who is 46 years old during the "Provisional Hero License" arc. Some sources suggest a slightly older range (53 to 56 years old) based on when he acquired his Quirk, One For All, but 49 is the commonly accepted age in the series for his middle-aged hero role. This age allows him to be experienced yet still actively fighting as a hero and to serve as a mentor to Izuku Midoriya.