Ask yourself, do you want a smart 25 year old running the White House? Or an experienced 50 year old?
I don't want to give them even more excuse to raise the retirement age.
"The country as a whole" is a very abstract concept.
I'm aware of the ridiculousness of this, but what can I do? You don't know what you don't know, and the alternative is to say you only know enough at the end of your life :)
I have seen some studies floating around that the most successful age to start a business is 45, so maybe that's closer to ideal, but in any case you will never convince me that the best age is in your late 70s.
Politicians will be pandering to this old (majority) demographic, whilst the needs of the young who are actually running society can be unheard. I'll be one of the (very) old ones if I'm still around, and I'm not looking forward to this development.