Men have always been considered to be the bread earner, they take a load of a toll on their bodies and mind.
That's the major reason, I believe.
Moreover, I believe, as men have the ability to reproduce for a longer period of time and women can not so 'nature' designed us in such a way to make a balance. Also, in later life, women can be a caretaker of the family (peace of mind for the offspring that they at least have one beside them).
What do you think?
Too confusing to get into a possible answer...if they have the ability to reproduce then why don't they live longer.
From my understanding, that will create kind of a chaos and imbalance. Having too much offspring ( known and unknown), increased divorce rate because they can access other options later, etc. But that's only my way of thinking, just another reason of million others. So it doesn't have to be true.
Edit: For example, if the spouse pass away many men can't stay single and support his children but remarry, even in old age and reproduce. That literally ruins his previous family (property distribution). I'm not judging here but this is what it is.
It's just an example but this is what eventually would be for majority of the men if they live long. Hahaha....