Ichigo will only live an average human lifespan, his soul will exist for quite some time after... unless he gets killed by Aizen or something.
Also didn't rukia say something about being ten times Ichigo's age? That would make her 150. Going by that equation...
1 Shinigami Year = 10 Human Years
Rukia Looks about 15 so 150
Renji looks about 15 so 150
Byakuya looks about 30 so 300
Urahara looks about 25 to 35 so 350 (although Urahara seems even older, maybe he ages really well. or found a way to age less)
Isshin looks about 40 so 400
Hitsugaya looks about 10 so 100
Yama-Ji looks about 80-90 so 800-900
And so on... but really this is all conjecture.