Earlier quoted context omitted.
Men die earlier, yes. You have a point there. [2][3] says that ~90999/100000 males survive to age 60 and ~94194/100000 females survive to age 60. That's a difference of ~3195/100000, or ~3.2%. However, the question becomes if men retire earlier. And the answer is no. [1] Women retire earlier than men on average (at least in Canada. Don't have stats handy for anywhere else, unfortunately). And that's measured in years…
Men at all age levels have higher insurance rates than women. This means they are riskier employees than women and if the reason women are being paid less is purely economic then the situation ought to be reversed and men should be paid less because of the higher risk. So clearly the reason is not economic but is a systemic bias. Yes, making an argument involving decisions that affect the life chances of human beings…
That assumes that only insurance-based risk affects economics.