Delayed fatherhood may lead to longer lived children/grandkids
myhealthnewsdaily.com
myhealthnewsdaily.com
I don't know how older dads do it. My kid wears me out at my current age. I suppose I'd be a much richer first-time parent if I delayed having kids, so I'd have more help, more baby sitting, nicer vacations, etc.
Also this article seems to support the theory of Lamarckian Inheritance. http://en.wikipedia.org/wiki/Lamarckism
I'm 47 years old with a 3 year old son. When my boy is my age, I will be 91, older than his only living great grand-father. Or, more likely, I'll be dead.
It makes sense to have more than one kid if you are an old first-time parent so your kids have family around after you are dead or very elderly.