I think she is just using average life span. There was an old apple app (I think called death clock), that when you opened it you entered your birthday and it

I think she is just using average life span. There was an old apple app (I think called death clock), that when you opened it you entered your birthday and it would tell you how long you have to live. Every time you opened it would just recalc. Always counting even when not running. It was a little freaky. "Your older than you've ever been, and NOW your even older, and NOW your even older still..." _TMBG