Nope, having children later increases life expectancy. People have theories about why but it’s not been proved IMO. I’ll try to find the paper later...
Sick short malnourished male is less likely to find partner, let alone have a children.
Study also excludes divorced men who technically have children, but do not live with them. Divorce decreases life expectancy severely.
We should really stop using the word "increases" to describe a correlation and use "goes hand in hand with" or something like that. Same for your usage of "decreases". ;)
I don't believe that drowning deaths are caused by ice cream sales either, but I can easily prepare the data in a way that makes that appear like a solid assertion.
Edit: I am intrigued by the downvotes. Perhaps I am wrong and ice cream sales actually do cause drowning deaths.