When do you die?

Here's another one from Malia. She asked me why do Moms and Dads and Grandpas and Grandmas know so much. I told her it was because we have been alive a lot longer than her and she has only been alive for 4 years (she said almost 5), and Gunner only 2 years. She said how long have you been alive? I told her, and she said oh, that's old, well when do you die then? I remember when I thought 27 was old too.