4. Having an ‘old’ father
This one is pretty unexpected as well but again, research has demonstrated that being born when your father was getting up a bit in years could be a sign that you will live to a ripe old age. Not a lot is understood about why this is true, or why researchers would even come up with the idea for conducting this type of research, but this might be a good excuse for guys who want to hold off a few years before having kids.