Life Force allows the user to double their life span, causing them to age at a slower rate, making them look much younger than they really are. That's why Kyudai Garaki looks like as if he's only in his sixties when he really is at least 120 years old. If the Quirk is canceled, the user rapidly ages into a much more decrepit shape.
At some point, Kyudai duplicated his own Quirk and presented the original to All For One as an offering while he kept the duplicate to himself.
- ↑ My Hero Academia Manga: Chapter 270 (p. 4).
- ↑ 2.0 2.1 2.2 My Hero Academia Manga: Chapter 270.
- ↑ My Hero Academia Manga: Chapter 260.