Original title is "我が半生" which is what we see VIZ went with. Furinkan went with "Half of my Life" because 半 is half and 生 is life. Presumably, there's a reason why VIZ left it untranslated like it is a distinct thing in this context.

November 9th, 2011. Author's note:
"Q: What animal would you go see at the zoo first and foremost?
A: Tiger!"