User blog comment:Uknownada/Brook the only eater?/@comment-4493594-20111022082754/@comment-4498721-20111022125258

And how long is "a normal life span" in OP universe. I mean Kureha is pretty healthy at 140, so even we consider Kureha as an exeption, a "normal" life span should be at least 100-110 years, i guess.

And for brook, after one point his soul will start to lose power, and ironically will die of old age.