Are you sure? Is it not the same as this: https://math.stackexchange.com/questions/1009490/average-number-of-heads-in-a-row https://math.stackexchange.com/quest

Are you sure? Is it not the same as this: https://math.stackexchange.com/questions/1009490/average-number-of-heads-in-a-row https://math.stackexchange.com/questions/1009490/average-num... E = p/(1-p) So pretty close to 80 years, no? I guess it gets more complicated because you'd die of other reasons as you age so there's no point including the eventualities where you reached 120 for example... I guess it gets pretty complicated in the end...