i think it depends on what you do to it. .. if you let it get married. . . it might leave you at around the age of 10ish. . .but if you don't it will prolly live up to be 20 or even more.. . that is if you take good care of ur tama!
Erm, I think what she is asking as if you leave it alone..how long before it dies. And I think that depends upon how many times you have assulted it to hunger and lovelessness in the past.