All Might is the strongest hero from My Hero Academia. As her name suggests, she was an extremely important figure to Japanese society and was able to resolve any crisis with a smile on her face and encourage everyone around her. But the events All for One was involved in severely weakened it.
All Might’s career came to an end after so many years that, although he was still alive, within a few months he was practically powerless and at risk of death. But in reality How old is All Might?? After the recent events in the manga My Hero Academia, we can make an estimate.
We know from All Might that he was a student at Yuei. Without the quirk it would have been impossible for him to access it if he hadn’t already donated Nana Shimura’s One for All. It is assumed that he received the Eigenart at about the same age as Deku, i.e. between 13 and 15 years. We learned that too in one of the final chapters of My Hero Academia All Might has had the quirk for 40 years.
It means that All Might is between 53 and 55 years old an age that may be higher than originally thought. In the meantime, the manga My Hero Academia has entered the final phase.